Kevin91Z

iTrader: (1)

I went to the dyno tonight to get some tuning done at WOT. I brought my PROM burning stuff with me. I started with 303 HP and 410 TQ at the rear wheels, with it lean in the midrange, and very rich at the top end. This was with the injector constant still set to 21.5 lbs. I riched up the middle and leaned out the top end some, and it picked up 4 HP and 3 TQ, still showing lean and rich. So I switched the injector constant to 23.9 lbs, and richened up the midrange to compensate (thinking the larger injector size would decrease the pulsewidths) and was resulted with another 8 HP and 1 TQ, but it was still rich on the top end. I then made one more chip, pulling more fuel out of the top end above 4800, and was rewarded with an awesome air/fuel ratio curve per the dyno's wide-band O2 sensor, which resulted in 12.5:1 flat line. This produced 317 HP at 5700 RPMs, and 418 TQ at 3500 RPMs, and was still pulling 300 ft/lbs at 5000 RPMs, at the rear wheels.

Given that the World Class T5 is rated at about 305 ft/lbs at its input shaft, I think its time for a stronger transmission, like the T56.

Much thanks go to Traxion, Glenn91L98GTA and madmax for their chip tuning help, and the rest of you PROM guys. Next I might try madmax's intake siamesing mod, after I get the car in the 12's. I'm going to the track this Sunday and also May 5th.

My mods are TPIS Big Mouth intake, TPIS Large Tube Runners, TPIS 52mm Throttle Body, 24lbs LT1 injectors, ported plenum, ported L98 Corvette heads, LT4 HOT cam with 1.52 roller rockers, AFR Hydra-Rev kit, and SLP 1 3/4" headers. Anyone who thinks those larger headers kill torque is mistaken. Maybe on a stock engine, but one with cam and heads needs the larger exhaust. My previous engine with a ZZ4 cam and SLP 1 5/8" headers made 380 TQ, so there is a gain of over 35 ft/lbs.


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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

[This message has been edited by Kevin91Z (edited April 19, 2001).]

86TpiTransAm

Those are nice numbers! However, with those mods you have listed you should be up between 350-375 RWHP and 450-475 RWTQ!! Maybe you just need to do a little fine tuning on the chip and on the engine itself! That thing's got plenty more potential!!

Let me know how things work out when/if you siamese the intake runners! I saw madmax's post and I'm thinkin' about doin' the same thing myself!

Grim Reaper

Nice numbers Kevin. You might even try leaning it just a tad more and/or giving a bit more spark. Are those RAW RWHP/RWTQ or are those corrected for elevation, temperature and humidity?

Pablo

iTrader: (1)

Im with glenn

actually you want it just a hair rich at peak torque.. maybe around 12.5-12.7:1 (probably closer to 12.7) and near the hp peak it should have curved upwards to around 13:1 or so..
so theres more power there kevin! Awesome numbers though

TRAXION

86TPITransAm is a little offbase on his proposed 350-375 rwhp. If you had a MiniRam intake then yes. LT1s with the HOT cam pull around 350rwhp. But, a long runner TPI setup will give you good torque numbers ... not rwhp numbers. Take a look at Mike Davis' comparisons of a fully upgraded TPI setup vs. the MiniRam. The MiniRam made more than 30 more rwhp. However, the fully upgraded TPI intake made almost 30 more lb/ft of torque. If you want those numbers then you will have to open up the intake more. Even a fully upgraded TPI intake will fall on its face at 4800rpms as compared to a MiniRam style intake. You might THINK and FEEL that a fully upgraded TPI intake pulls hard past 4800 ... but, if you think that, then you haven't been in a MiniRammed car ......


Red/Pink is the fully upgraded TPI. The others are the MiniRam. No other changes. The car is an '85 Z with a ZZ4, LT4HOT cam, 58mm TB, 1-3/4" headers, blablabla.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

[This message has been edited by TRAXION (edited April 19, 2001).]

[This message has been edited by TRAXION (edited April 19, 2001).]

Ed Maher

Tim, that is a lovely graph, you shoulda threw that into the SR vs MR post a few days ago. Even though it isn't comparing to a MR, it still shows that just cuz the MRs peak torque isn't huge byt tuned port standards, its so damn flat that who wants a big peak.
I'm with you guys, when this LB9 blows up, big inch MR here i come.
...ed

86TpiTransAm

A stock intake with Madmax's siamesed runner idea would produce the MR numbers I'm sure PLUS it would have much more torque too! Just my opinion tho'! The "intake design" is still being tested on so I'm sure there's still plenty of work to be done! Personally, I feel that stock TPI has plenty of potential....we just haven't "figured out" how to tap into the extra power yet!!

TRAXION

86TPI ... now *there* is where I will definitely agree. Opening up Kev's intake via the siamesed bottom runners is what will give him some serious gains.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

Bort62

Impressive Kevin, cant Wait to get a look at it come may


Im also interested In The Siameseing of the base, if you pull a 12 this sunday, any chance We may see this at famoso ?


Would love to see some before and after Dyno pulls With that as the only change.




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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

Kevin91Z

iTrader: (1)

Ian, I'm not touching a thing until May, I dont want to get left out! Right now all my effort is going into the shootout, and I am also looking for a local T56. I will definitely do a before/after dyno if I do the intake siamese mod.

Glenn, no those are raw numbers. I forgot to get the correction factor.

My BIN and Diacom GDF files are at http://24.1.139.249/dyno/ for those who are interested.

Pony Killer

Good numbers Kevin. Good work eeking out a few more ponies here and there, if you keep going a little here and there, and get it to the road, you'll find yourself in the mid twelves if you've got some real good bite.

Scott 88 GTA

Wow. Those are some great numbers. I can't wait for when school is done in another two weeks. I'll finally have some time to start playing with my EPROM, and hopefully get some more out of my engine.

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Black 88 GTA L98
261 RWHP, 345 RWTQ
13.406 @ 103.72 MPH
ZZ4 bottom end, Edelbrock 6085 heads, LT4 HOT cam, GMPP 1.6 RR's, ported stock TPI, SLP 1 3/4" headers, no cat, Dynomax cat-back, Stock PROM
E.T.F.A Member #11

RCR

I can't wait for my tranny to show up so I can try mine out also.

Kevin, since you brought it up, how does the wide band 02 hook up when they dyno? It can't replace the existing one, ,so is it piggy-backed somehow, or do you have two spots for the sensor. Just curious.

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Bob '89 Ram Air Formula 350
Last(lost)Member of the Elusive Great Lakes Crew
My car's homepage

leirch

Kevin,
I'm going to snag those bins you have there for your car, i am going to speed density pretty soon(thanks Mike Davis!!), I have the conversion harnes completed with the help of a buddy. So i'm trying to gather some bins to start with since my car isn't "stock"...
Could you send me an email with a detailed description of your car? What it has?

Brendan

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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

To see the ROC, Check out the webpage Here

james_fearn

What is your compression ratio Kevin? Do you know the flow number of your heads??


James

Kevin91Z

iTrader: (1)

RCR, I put an O2 sensor bung in the passenger header so I can switch between the left and right side to see the O2 readings. I just removed the right O2 sensor and screwed the dyno's O2 sensor in its place. Other dyno shops have O2 sensors that plug into the tail pipe like at the emissions place.

Leirch, my mods are in my first post, and also in my sig, click on the link.

James, I computed my compression ratio to be 10.3:1. I havent gotten my heads flowed, so I dont know.

Also, my dad wanted me to say that these runs were made thru stock CarSound cats, not gutted.

Bort62

Really kev? I bet you can get 10-15 HP by removing those cats alone.




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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

86TpiTransAm

I dunno about 10-15HP but I know that I did notice a performance increase when I removed my cat!! I would say more like 5-10HP....but hey, get what you can right!

Kevin91Z

iTrader: (1)

Why? CarSound cats flow the best, and plus I have a cut-out right after them so they dont restrict much.

Edit: I should have said the cutout was closed for these runs. All exhaust went thru a flowmaster muffler.


[This message has been edited by Kevin91Z (edited April 22, 2001).]

86TpiTransAm

CarSound cats may flow the best when comparing cats....but for the BEST airflow NO cat at all is the best bet!! The cut-out probably helps tho' so your setup is probably great!