99MONGOOSE

I have a 1987 Iroc-Z L98 motor with adjustable cat-back, 3.72 GEARS (9 BOLT), SHIFT KIT, HYPERTECH STAGE 2 THERMOMASTER CHIP, 160 DEGREE HYPERTECH POWERSTAT, FAN SWITCH, GUTTED AIR BOX. The best ET so far has been a 14.3@94 mph 2.0 60ft. on radials with minimal spinage. I would like to get it into the mid 13's with bolt ons. Any advice on parts needed?

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1999 Camaro SS LS1 m6
1987 Iroc-Z 5.7 TPI
1984 Camaro

Mark305TBI

Does N20 count as a bolt-on? a 125-150 shot would put you in the mid/low 13's (13.2-13.5), easy. You can't beat it for cost efficiency, $550 for about a second off your ET's. Just a thought...

-Mark W.
'88 SC Camaro w/ 305 TBI

Blade

A set of good heads will shave quite a bit off your ET also.

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[This message has been edited by Blade (edited February 06, 2001).]

HiTech5

iTrader: (4)

Here are my suggestions: Install a 1985 Corvette Torque converter. This should stall about 400-500 rpm higher than the one you've got now. Add some 1.6 rocker arms,March Power and Amp underdrive pulley set and bypass your air pump. Also bypass the coolant going to the throttle body. Last but not least,I don't care for the 3.70 rear end ratio with the long runners of the TPI. Ratios in the range of 3.27-3.45 work best at taking advantage of the strong torque curve. One other thing,play with ignition timing. I've found that in cool weather,a base timing of 10degs works well,when it warms up some bring it down to 8degs btdc.

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D&Z Performance
"Putting Power to the Pavement"

99MONGOOSE

Thanks guys. You say yhe 3.70 gear is to much? I thought is was too when I had my first pass, because I was going through the traps @5200 rpm in 3rd. (drive). The car just didn't have the rpm to make any power up there. Now my SS thats where it starts to make power!!!HAHAHA
Thanks again

MARKT111

A lock up switch for your torque conv. will drop your RPM's at the end of the track,I would install headers next and concentrate on hooking up and you'll easilly hit the 13's,try drag radials or slicks

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89 FORMULA 350,WS6 SUSPENSION,HOTCHKIS STB,KONI REDS,WONDERBAR,SLP REAR CONTROL ARMS/PANHARD,POLY BUSHINGS,FRESH 355 MOTOR,TCI 12" STREETFIGHTER,TRANSGO SHIFT KIT,3.70 GEARS,FLOWMASTER EXHAUAST,SLP 1 3/4 HEADERS,NO CATS,58 MM BBK,MINIRAM INTAKE,COLD AIR,ALL FREE MODS

Dan87IROC-Z

NO, Keep your 3.70 gears, don't get rid of them, they are rare and the perfect gear for that 6 speed that should be in your future. A set of headers would work great on your car, take a good .3+ off your 1'4 ETs.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

99MONGOOSE

I don't have the money for new heads now because I am building up my 1999 SS again! But I would like to purchase a set of AS&M Siamese long tube runners, TPIS ported plenum, edelbrock base, TPIS fast pack, and SLP shorty headers. What do you think of this combo? Should I have anything done to the Edelbrock base or the runners? I don't want a cam yet just bolt ons. Are the SLP header good? What size 1 5/8 or 1 3/4 ?

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1999 Camaro SS LS1 m6
1987 Iroc-Z 5.7 TPI
1984 Camaro

theformula

Headers alone should do the job and a good cold air intake system will definitely put you there.

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91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton SN93, SLP airfoil, ported/polished plenum, March pulleys, Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires, fastchip, Bosch O2sensor, Bosch in-line pump(w/stock pump), SLP headers & catback,short shifter,3:73s w/Auburn posi,170* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

HiTech5

iTrader: (4)

To get the most out of the AS&M runners,make sure to check the Edelbrock base so that it has a good gasket match to your new runners. Most aftermarket bases need some cleaning up in the entrance. Another item I would add are 1.6 rockers. They give more lift and slightly more duration which will take advantage of your new intake pieces. If your not equiped to matching the manifold,I can do it for a small charge.

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D&Z Performance
"Putting Power to the Pavement"

[This message has been edited by HiTech5 (edited February 08, 2001).]

99MONGOOSE

how much for gasket matching? Should I remove the hypertech stage 2 thermomaster chip?

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1999 Camaro SS LS1 m6
1987 Iroc-Z 5.7 TPI
1984 Camaro

Superblue87Formula

you need headers!
my 87 formula 350 w/ 100k miles ran a 14.41@95.5 and the only mods were accel supercoil and headman shortie headers. I bumped the timing and got it to pull a 96.5 in the traps but couldn't get traction to pull a good e/t could have had it running 14.3's.
If you decide to ditch your gears, I'll trade you my 3.27's for em (9 bolter here too) I'm switching to a carbed setup myself..

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1987 Formula 350, headman hedders, Accel supercoil, cap, rotor.
MAF screens removed. 160 degree stat and manual fan switch.

Best ET: 14.745@91.317mph-Stock
Best ET: 14.418@95.51 mph-Modded
Ridiculed Founder of the Traction Impaired Crew

HiTech5

iTrader: (4)

99MONGOOSE - E mail me to discuss.

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D&Z Performance
"Putting Power to the Pavement"

CamaroMike

?

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84 Camaro ZZ4 with HOT cam. 1.88 60' (12.98 @ 105MPH E.T.)
Other Mods: You name it and I have probably changed it.

2001 Dodge Ram Quad Cab 5.9L 4*2

http://www.geocities.com/camaromike84/camaro.htm
ASE Certified Auto Tech
LIVE AND DIE BY THE ALMIGHTY BOWTIE!

RARE-ROC-Z

i got a 14.03/97.4mph out of my mods and i was running warm that day. and i spun throught the 60'. that is just me. and my car came stock with more power than yours. sorry but i wish i had those gears.

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1990 IROC-Z L98 350 TPI
AFPR 49PSI, GUTTED AIR BOXES, K&N, RAM AIR, UNDERDRIVE PULLEYS, PORTED PLENUM, B&M SHIFTER, 3.23 LIMITED SLIP, DUAL CATS, STOCK SUPER TURBO EXHAUST, COOPER COBRA XST's

MUSTANGS...ONLY 4 LUGS....HAHA THAT IS HILARIOUS.

99MONGOOSE

That is fast for stock!! My buddy has a 1992 Z28 5.7 TPI all stock. He put new injectors in it but that it, I wonder what he'll turn 1/4 mile?

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1999 Camaro SS LS1 m6
1987 Iroc-Z 5.7 TPI
1984 Camaro

Kevin91Z

iTrader: (1)

You've picked a good set of parts there to add to your car. You dont need the fast pack or the plenum from TPIS, you can do that yourself. I'd also think about a cam swap, as 87 350's have the smallest cam out of the 87-92 350's. I'd get the SLP 1 3/4" headers. There's a GP on them right now in the GP forum.

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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=-

99MONGOOSE

What should I do about a chip? I have a hypertech thermomaster in right now. Are the SLP headers coated? What cam, maybe HOT LT4 or ZZ9?

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1999 Camaro SS LS1 m6 12.6@112mphw/1.9 60ft
1987 Iroc-Z 5.7 TPI best et. 14.3@94mph w/2.0 60ft.
1984 Camaro

99MONGOOSE

Is there a 3.45 gear ratio for the 9 bolt rear end?

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1999 Camaro SS LS1 m6 12.6@112mphw/1.9 60ft
1987 Iroc-Z 5.7 TPI best et. 14.3@94mph w/2.0 60ft.
1984 Camaro

Kevin91Z

iTrader: (1)

Yes there is 3.45 gears available for the 9-bolt, I have a set in my car. But they're only available stock. Aftermarket companies only sell 3.70's.

The LT4 hot cam would be cheaper, but you'd need a bigger stall converter than the 2000 RPM one from a Corvette.

HiTech5

iTrader: (4)

Quote from Kevin91Z-The LT4 hot cam would be cheaper, but you'd need a bigger stall converter than the 2000 RPM one from a Corvette.[/B][/QUOTE]

I have sold the Corvette converter to quite a few of my customers and all have enjoyed great success with it. I myself have produced 1.66 60 ft times with one.

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D&Z Performance
"Putting Power to the Pavement"

[This message has been edited by HiTech5 (edited February 16, 2001).]

99MONGOOSE

This converter you are talking about, it is a stock corvette torque converter? Wouldn't a Precision Industries be better? What is the cost of your converter? Where can i get the 3.45 gears?

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1999 Camaro SS LS1 m6 12.6@112mphw/1.9 60ft
1987 Iroc-Z 5.7 TPI best et. 14.3@94mph w/2.0 60ft.
1984 Camaro

mirage2991

by the way, it's off subject a bit, but with 3.72's and your MPH (94), assuming you have around 26" tires, you are not crossing at 5250 rpms, but more like the high side of 4750...just so you know...sounds like your tach is off (stock??). Mine did the same....if you don't belive me, check with the equation (I think it is on this board or at f-body.org and so you also know, I do run the 1/4 at 94 also and my aftermarket tach is also reading 4750rpms.
later



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85 Z28, 355, edelbrock base, SLP runners (old style) 58mmTB, ported plenum, stock cam, fuel reg, TES headers, flowmaster, 3.73's, shift kit, MSD 6a, 305 hypertech chip (YUUUCK!) best prior intake mods: 14.6 @ 94, 2.02 60' temp: 78deg, 80% moist, on radials.
69SS, black, 3,73's, TH400, 402 BB, roller everything (solid 246@50 622 lift)+stud-guirdle, 67 Vette heads ported and o-ringed, about 10:1 cr KB pistons, should be done this summer, goals: 500hp and lots of fun

Kevin91Z

iTrader: (1)

Yes, the Corvette stock converter is nice, but I'm saying for an LT4 HOT cam, its power band is 3000 RPMs and higher. You'd want a higher than 2000 RPMs stall converter with it.

I like the Precision Industries Vigilante, but it is expensive.

The 3.45 gears are only available on stock 305 5-speed TPI cars. I dont know of an aftermarket source for them.

He meant to type 3.27 gears, not 3.72.

HiTech5

iTrader: (4)

The Corvette Converter sells for around $350 vs $725 for a Vigilante. The gears were available from GM but I'm not sure if they still carry them.



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D&Z Performance
"Putting Power to the Pavement"

Earl 87gta

I have the 9 bolt rear in my car with 327 and i would like 345 or 370 for it so if you get rid of your 370 let me know.

99MONGOOSE

I had 3.70 or 3.72 gears whatever they are, installed a week after I got the car along with the shift kit. My tach reads just past 5000 rpms thru the traps dont't know if its off or not. I would like mid to low 13s with stock heads for now. Any suggestions? My 99 SS was very easy to mod and get the times I like, but this TPI isn't as responsive to mods.

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1999 Camaro SS LS1 m6 12.6@112mphw/1.9 60ft
1987 Iroc-Z 5.7 TPI best et. 14.3@94mph w/2.0 60ft.
1984 Camaro

mirage2991

your tach is off...no flame bud, just so you know, I just get anoyed at people that says there stock TPI goes 5500 or whatever, plus an acurate tach read out will help ya when you tune the car, still no flame bud...I think 13's is gonna require some tuning...also I did see a 90 Z28 do 13.9 on DOT's, and 3.23 gears and clames a best of 13.7 with 1.8 60'. I personaly think that 3.70's (3.72's, 3's what ever) are to steep for our cars. I'm in the process of going from 3.73's to 3.23's and see what'll do.
for the mods I'd say if you keep 3.70's you probably need a better cam that will rev up to 5500 to 6000, then if you do that, you'll need a better intake. You could try som 1.6 rollers.