Hey Guy's. I have been on here for several years but haven't ever posted. Since I actually have some thing to say Now I am

I have been messing with my Iroc on and off for several years and its finally started coming together.

Mods (As I can remember them)

Edelbrock TES
3 inch under the car/ Loudmouth muffler/ no Cats
Owner ported/simesed Plenum
Simesed SLP Runners
Simesed/Ported stock intake
adjustable regulator
1.6 Roller Tip rockers
underdrive pulley
de screened maf
gutted airbox/ K&N filters
160 Thermostat/cooling switches
Swapped T5 for T56
Working on the Chip Tuning right now.

Here are a couple of pulls

 

I am very happy considering that the car is pig rich. We are leaning it out, shooting for 12.8-13.0 A/F ratio. I would love to see 10 more HP but I suppose we will see.

 

I have been reading a lot of past posts and this seems to be about in line with what others have accomplished with similar set ups.

 

Good work- looks good. You should be happy with that.

 

Thank you! I really am. I plan to post up the new number is a couple of weeks after I get the A/F issue worked out.

 

Way rich, you'll see a decent amount of power up top with leaner tune. Dont go too lean tho, dynos never really load the motor up like the street does. So leave it closer to 12.5 to 1 air fuel, and on the street or at the track, you will see closer to 12.8-13 to 1.

how much timing are you running?

Not bad for a 305 considering its still rich as hell.

 

Thanks Brother! Its running 36 total all the way up right now. We are going to try 1 more degree above 4400 just to see if that will help a little. Its not pulling any timing at all right now. I wish it would pull up a couple hundered more before it started going flat. I only have a couple of other little mods I am thinking about. The better quality Y pipe, mine is a stock looking design. and maybe even an airfoil. (in that order) After that I will live with whatever I get power wise.

 

pretty neat setup, gives me something to look forward to i guess. We are almost dead on same mods currently, kinda funny actually.

i currently have 1.6 full rr's, airfoil, k&n filters, 2 pc underdrive set, edelbrock headers, catback, alluminum ds so on.....

i'd love a little more information if you could though. what year is your car? Are you running a speed density setup or maf? What size injectors? What is your current fuel pressure at the rail.

i know lots of questions, but i would truly be greatful if i had some answers (would save me a headache down the road).

i think you should look in to a camshaft swap in the not to distant future. Thats where you will ultimately take use of all the gains in porting to your intake.

i'm honestly quite impressed by the numbers you achieved. especially running that rich. I'd be quite happy if i was running 250hp with all my current mods, + my ported and siamesed intake setup, ported heads and crane 2032 camshaft, but time will tell....

 

My car is an 89 with the original 230HP 305. When I dynoed it back in 2003 I made 192 HP. and it was rich then as well. I am running 39 psi line on. I am running the original 19lb injectors. It's not likely I will need to put bigger injectors in unless I change to a bigger engine. Its a maf (I have two this one is descreened). I have considered trying a dyno run with the other MAF that has it's screens. I am lucky on the Cam right now I have the 10066049 cam (207/213 .415/.430 117LSA) with the 1.6's I am getting about .445/.460 lift. I expect to re-dyno in a couple of weeks. I'll post up those results when I get them. I would think if you can get your A/F ratio and timing on you won't have any problems getting the 250 you are looking for.

I don't mind answering questions. I don't claim to be an expert on the 305 or TPI. I have just done a lot of reading. I have 99 Corvette making decent power and a 69 Firebird w a 455 makeing decent power as well but, I am really enjoying this car. It's just fun to drive.

 

Are you using the stock PROM?

 

very kool sir, yah we are pretty much in the same boat. mine runs richer than sin, although i don't have any data on that...... a previous owner installed 22 lb hour injectors and never tuned the injector constant after the fact. So currently i'm at 40lb psi line unhooked and it still smells super rich. i'm running the same 89 maf setup as well. same cam as well.

have you tried backing down your fuel pressure a few lbs to tame your afr? Also kind of curious what your timing is set at.

 

I bought a custom chip from an online supplier. I really didn't run that well before I got the chip. The first chip I got from him made light years of difference. Looking at the dyno I saw though I still saw some areas needing improvement. I sent the dyno information back to chip guy and we talked about it on the phone. I should get the chip back Saturday or Maybe Monday. Years ago when I dynoed the car it only had a few minor mods done. It had a gutted air box, and I think an underdrive pulley. Ironically it was just as rich then as it was this last time two weeks ago. The dyno also shows a retriction around 4400. The converter Y pipe has the stock y junction so I ordered a y scavenger collector and an air foil. As I was saying earlier I am hoping it will pull up to 4800 - 5000. If it will even go 2-300 more I think I will be satisfied with it.
Its a blast to drive now though.

 

I backed it off the other night. to around 38, line on. I will try that on the dyno and if it isn't right I'll move it back where it was. Base timing is at 6deg. Total timing on the new chip gives me 36 deg. No sign of detonation. BTW 93 octane is all I run.

 

Flaming-Ford, one difference I do see is gearing combo's we are running. Th WC/T5 should have a 3.35 first. Given your 3.08 thats a total first gear ratio of 10.13 to 1. With my 2.66 gear in my T56 and my 3.45 rear I have a 9.17 first. Depending on your torque that might be your advantage in first. Once in 4th the 3.45 would probably be my advantage. High Torque engines do run real good on 3.08 gears though. Thats what I run in my Firebird.

 

i don't own a digital timing light so i'm not really sure of my total spark advance, but my base is set at 6* btdc as well.

i've done a lot just to get mine back in to a decent state of tune ,but i've still got quite a ways to go. Mine has a recent tune up, new distributor, new coil, new module, new air filters, just sea foamed the upper intake so on......

The problems with mine are vast though, the injectors are probably my biggest drivability problem in question currently. Therefore i know my fuel curve is probably at least off by about 13%, although i did temporarily try and band aid that with lower fuel pressure (doesn't seem to help at all). Then of course is the fact that the engine is a jasper reman, so i'm not sure of the compression ratio or exact camshaft installed. Then there is the fact that the heads on mine are 187 casting not 081 which use much less timing that tpi heads. Mines just a mismatched mess.

http://s3.photobucket.com/albums/y71...urrent=008.flv

thats a quick startup clip of mine, unofortunately it wasn't fully warmed up yet so it's hard to hear its slight loping and rich running. Funny thing is the blms are always dead on when i hook a scanner to it........

just curious who was the chip supplier you went with, i can't wait to order 1 myself as soon as i get mine put together with the new parts. Just changing the injector constants in the chip should make a night and day difference.

 

Not the cheapest in the world but he has good feedback and I was very happy with his service. I can't wait to get the chip back from him.

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWNX%3AIT

 

I loved my little 310 TPI....It was a vortec block with the GM 845 cam and ported 059 vortecs. STRONG runner with over 300 RWHP on stock runners and plenum.

http://s243.photobucket.com/albums/f...t=101_1468.flv

http://s243.photobucket.com/albums/f...t=101_1471.flv

http://s243.photobucket.com/albums/f...t=101_1472.flv





I have more mods ready to go and need to build a nice 4L80E to go behind it.. I will be swapping to OBDII and an 0411 PCM with a 2002 2500 Express 305/4L80E based flash.

 

"I loved my little 310 TPI....It was a vortec block with the GM 845 cam and ported 059 vortecs. STRONG runner with over 300 RWHP on stock runners and plenum."

AWSOME little engine! The video os kind of quiet but from what I can hear it sounds great! Smart move, TPI would be a natural for a 3/4 ton van or a pickup. Like I had said in an earlier post, I have two other cars that are faster/more powerful than my Iroc but I really like my TPI Iroc. For a daily, it does just what I want it to. It really does look cool as well. (engine and car)
If you like Torque the TPI can really suck you in! (pardon the pun lol).

I have a couple of pictures of the intake stuff apart (I think) in my laptop. If I can find them I will post them up later.

 

It really was an awesome little engine, it did EVERTYTHING it was supposed to do very well.... Had great power, incredible throttle response, and would push the brick into the wind at 80 mph and still get reasonable MPG. I could tow a decent sized boat at 60 mph and not even notice it was there. I was running the stock 3.08 gears and stock 2,000 rpm converter in the 4L60E. The 700r4 transmission was slipping in that video and the videos I have of after the 4L60E are in darkness. But you can hear the improvement with the crisp shifts at 5,500 and NOT bouncing off the 6K rev-limiter.

The video's are a little quiet, because the engine was pretty quiet. It had Tri-Y headers into dual 2 1/2" pipes, into a X-pipe, into high flow cats, into Dynomax RV mufflers, and out 2 1/2" dual tail pipes on the driverside. The intake was actually 3" sewer pipe into a large cone filter outside of the engine compartment above the inner fender.

http://s243.photobucket.com/albums/f...t=101_1403.flv

The assembled product looked GREAT, even in a van..



If you happen to want more out of you engine someday, I would look somewhere other than your current 081 heads... Your car would LOVE the 059s and a ported 3817 Edelbrock lower intake.. Both can flow VERY well.

 

I have a couple photos of my TPI set up when I installed it a couple of years ago.

 

Subscribing. So do you think that a new chip alone makes a big difference in the 305 TPIs? I could care less about HP/TQ numbers, I just wanna faster launches/0-60 times.

 

Too bad the torques not moving up with all you've done to it.

 

What I think is that if you start changing/adding speed parts on a car that is tuned with factory specs, ie timing, A/F ratio, that will not perform to its best until until those are optimized.

The more you change the further off the A/F may be. Higher numbers (especially under the curve) give you the ability to do quicker 0-60 and 60ft times.

On a 305 that has no real changes I wouldn't expect a lot from just a chip change.
Something else to think about, If I had not dynoed the car I would not really be able to see what my work has gained. I also would not have found the restriction in my exhaust system. I had never noticed that my Y pipe necked down to 2 1/4 inches before the 3 inch pipe. Now, it goes in to a 3 inch collecter.

The car sounds different and revs better. I would have found this if I looked at it more closely. The dyno sheet just puts it out there and compelled me to examine things more closely.

 

I will say Brian at tbichips has been great to me as well, twice I have gone to him with a problem, and both times he helped me and didn't sell me something I didn't need... He could have easily ripped me off. I will deal with him again.

 

did you notice any gains? what setup are you running in your engine?

 

Hey Guys, I finally got my car re dynoed with the new chip. It has a total timing of 36 withan extra degree after 4400 to make 37. Its substantially leaner than before as well.
There are a couple of other changers that were made. First I did change out my Y pipe, added and air foil and opened up the Air Boxes even more than before. My Smog pump had siezed up and so I repaced it with a Delete pulley.

I am very satisfied. I did have to dyno with one of my header tubes leaking at the head. I have since fixed it. I doubt that it would have really changed much though. The weather was very similar as the last dyno.
It peaked at 9 more HP and 5 more ftlbs of Torque. The avererage numbers are really better. It averaged 10 more HP and 16 more ftlbs of Torque.
Overall I am very satisfied with the results.

Best Dyno with Air Fuel

 

I would really like to know what type of numbers you're pulling after your cam swap...

 

Back from the dead.. (sorry 350 guys)

Any progress made? Really good numbers for some bolt ons.

 

I am putting the parts together to do a 350 right now. I plan to retain everything from the 305. I have the HotCam, 218 228 @.050 and .525 .525 lift with 1.6's. I still don't have any heads. I hope in the next couple of months to have the heads. Something is wrong with either my clutch or transmission so I am not driving it right now. I think it's my throw out bearing. I'll redyno with the 350 once I get it running. I am going to have to do some tuning since I am changing from 19lb to 24lb jnjectors, cam swap, and more cubic inches.
I don't have any specific power goals right now. I do want to get north of 300 RWHP though.

 

I would have figured with a Vette and a Firebird you would have left the 305 in there.
but thats okay if you want to be like everyone else, I wont say anything! Have fun with your 350! LOL - j/k!
300 rwhp with TPI seems do able..especially with a nice aluminum head all tho vortec irons can get you there with some attention to detail and nickel and diming every HP you can.

 

The 305 has over 300,000 miles on it. I use the (normally) for a daily driver. Since I need to freshen it up, I decided it would be just as well to go with the 350. It has run pretty good with the 305 but It's a good bit slower than my other two cars. I decided to see how a 350 would do. I bought an inexpensive, low milage, short block. If the engine had a lot less milage I wouldn't be doing it. I might have tried a power adder like a turbo or supercharger. I got the short block for 175, and found the cam for 130. all I will need will be some heads and I will have everything to put a decent 350 together. I am hoping to stay as close to $1000 as possible. I can't get it running for that but I should be in the ball park. It's all good though. I like the 305. It was getting 27 - 28 on the Highway with the T56. I expect that will drop by 3-4 mpg.