I'm wanting to be in the 13's, preferably at a comfortable LS1ish 13.6, but a 13.99999 is stilll 13's to me. What is the best way to get there? I'm planning on a crane compucam, though not sure what lift, 1.6 roller rockers, and a timing gear set. Anything else that will get me there? I doubt I'll lose the .75 I need to ditch to get there on a cam and rockers alone...

-Reno

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89 Formula

 

Crane cams won't get you there! Get a comp cam or an LPE cam!! 1.6 roller rockers, a nice set of aftermarket heads, a modified TPI setup, headers, and most definitely a modified chip....NOT a HyperCRAP chip! Get that stuff done and you should be on your way to 13's easy!

 

305 or 350? It greatly affects the answer.

 

Oh, sorry, I guess that would be important, huh? It's a 350 TPI, dual cats, SLP muffler. Already has a K&N and AFPR, and ported plenum. Runs a 14.7 now, according to the last owner (Guido, so I trust it).

-Reno

 

Torque converter.

 

Second the converter. Add headers and you'll be there. My car was running 13.90s in 90 deg high humidity air with the parts in the sig.

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89 Formula 350, Accel Tri-Ys, 3" SLP, Jacobs, SLP cold air, Probuilt tranny, Vigilante, 3.27s, Spohn torque arm & LCAs w/brackets, GW Subs

 

so taking away the suspension, which I assume doesn't help too much, you're doing 13's on tranny, intake, and exhaust alone? Sweet...

-Reno

 

Rick, It ran 14.5!!

Vigilante torque converter! They are kinda pricey at around $700 but they are the best bang for the buck you can do to an F-Body.

Id get a comp cams extreme energy grind if I were to get a cam of any kind.

Also, the LCA brackets that are welded to the rear end to re-position the mounting point of the LCA, DOES help, even on stock ride height cars.

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-86 IROC
a few mods
this years goal: 10.50 @ 130+ mph
-=ICON Motorsports=-

 

Torque converter, SLP headers, exhaust, and drag radials should get you there. Then you can port your stock intake, and add 1.6 rockers for a couple more tenths. Get a cam and heads when you want low 13's.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

14.5 is a good time for the car. Your first cash outlay should be for headers. You can get into the 13's with only headers, catback, and simple intake mods. The catch is the air needs to be cool and dense and the track biting hard. My car ran 13.90s w/o the converter and suspension on really good fall and spring days. It slowed down to 14.30-14.50 in the summer. The converter and LCA brackets were worth an honest 4-5 tenths which is huge and really surprised me.

Guido is right about the LCA relocation brackets. They are a benefit to any decent running thirdgen. I didn't bother to adjust the pinion angle of the torque arm so it wasn't a factor at all.

When it comes down to it, the single best investment at this point will be the time you spend running the car down the track and learning what it likes. Play with timing, fuel pressure, tire pressure, launch technique, etc. Buy or borrow a scan tool to monitor timing, knock retard, oxygen sensor output, and other good stuff. Keep good records and enjoy your new car.

 

I'll second that! Comp Cams actually has developed 4 Xtreme Energy grind cams recently that are made for TPI! They're in the new catalog! It says 87-up but I called Comp and they said that it shouldn't say that and that it will work find on older block stuff...my '86 TPI for instance!! The 4 cams are similar to the 4 smaller Xtreme Energy cams! The 262 Xtreme Energy Compucam has a 218/224 duration @.050 and a .464/.470 and is ground on a 114 LSA! Whereas, the regular 262 Xtreme Energy cam has the same duration 218/224@.050 and the lift is .462/.469 and is ground on a 110 LSA! So the two cams are very similar but the TPI likes less overlap and the 114 LSA helps out with that a bit!!

 

Wouldn't that destroy any possible hope of passing emmissions though? And wouldn't it make the computer $hit kittens? Also, I've heard that 112 is the optimum LSA, any input on that?

-Reno

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89 Formula

 

You already said it, buy a LS1.

 

i would agree on the relocation brackets and lcas, i got steves,after the install they throw you back in the seat instead of burning a big pile of somke and they rock, 89 formula 350 tpi, 9 bolt rear 3.27 , went from 9.8 to 9.4 in the 8th mile, just by adding the lcas and reloaction brackets, still on street tires, then i added underdrive pulleys and all the free mods, still on street tires, went down to 9.2 , which in return is around 14.3 to 14.5 in the 1/4th keep in mind that this car had 250k on the engine before i finally blew a head gasket, so i think with a good converter and drag tires and the lcas and brackets, and a full tune up , i think ya be in the 13. or have a good shot at it , just keep in mind those lcas and brackets give the rearend hell, i think i busted mine, no posi and it leaks and makes nosies sometimes lol, so im sure when the 383 goes in it will finish it off,

 

how about a a good ring and pinion, l'm not sure what youve got in there now but a 3.73 should brighten it up

 

True, the cams aren't emission legal but there's ways around that!! As far as the chip! The cam I mentioned will work fine with any aftermarket chip! The next step down requires NO modifications at all!!

As far as the LSA! The bigger the cam, the more LSA you need because TPI doesn't like the overlap that causes the car to idle rough! Plus the LSA helps with the fuel mileage!! Of the 4 Xtreme Energy computer cams, the 2 smaller ones have a 112 LSA and the 2 larger ones have a 114 LSA!! Comp knows what they're doing and their cams are much better than Crane! IMO!!

 

It has a 9 bolt rear end.

 

9 bolt?? 2.77's?? That's what I got .... they suck!!

 

3.27's I understand...

-Reno

 

What kind of MPH are you guys running when you hit high 13's? I ask because i can only coax my car into low 14's due to wheel spin, I've run as fast as 100MPH on the track and 103 on the Gtech, since then I've added SLP headers, underdrive pullies, and the homemade ram air, with proper traction can I expect a 13 on my timeslip??

 

ok i started off running 14.7 my first times ever racing.. then i learned my car got down to 14.4, then i ported the plenum, K&N, underdrive pulleys, ram air, AFPR, and i ran a best of 14.03, 97.8mph
i plan on running better this year. RLCA brackets, LCA's, Torque arm, Aluminum driveshaft(just installed), New Shocks/struts ( also waiting to be installed). and some other mods.
i know i will be in the 13s, but i also came with a few more HP than your car stock. and i have a 3.23 rear.

i know that if i went with a Torque converter, 3.73 rear, torque arm, LCA's and brackets, headers and exhaust, and siamesed runners and base. and someday a supercharger, but i will be rebuilding before then!!

have fun. and dont redlight!

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Jarrad
1990 IROC-Z L98 350 TPI
TH-700R4
G92- 7.5" 10 Bolt 3.23gears
Bright Red Hardtop/ Grey Custom Interior
5,507 IROC's Hardtops/Ttops; 2,415 5.7L IROC's Produced in 1990

DAILY DRIVER: 1991 S10 2.5L/5SPD WITH CAMARO RIMS

 

How would your L98 have more horse then mine? Just a trivia question, really, but stock, I thought they were pretty much identical from 89-90?

-Reno

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89 Formula

 

no maf/ speed density to me they are equal headaches with both systems, and 89 stock had 240 and 90-92 had 245 i believe, ?

 

Yes you can!!! 13.98 @ 96.95 mph 1.913 60 ft. Invest in a good set of Drag Radials.

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1988 GTA 5.7L TPI Auto
355 ci. block,TPIS ZZ-9 Camshaft, SLP Headers, Borla Cat Back, B&M Holeshot 2400 Stall Converter, 3.73 Richmond Gears

"Why ride a stang when birds can fly?"

http://www.geocities.com/thegta

 

Thanks, I hope to find some tires for the Test and tune on may 13th. I'll reply with some numbers.