Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > TPI
Register Forgot Password?

TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by South Bay Fuel Injectors
Click Here

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 03-02-2001, 04:02 PM   #1
Junior Member
 
Join Date: Jan 2001
Location: Vadnais Heights, MN
Posts: 9

Classifieds Rating: (0)
Stock L98 upgrade

I have a stock '89 L98 engine and I want to get about 400hp out of it and still use as a daily driver. I'll get the heads(cast iron) ported, upgrade exhaust, upgrade intake (super, mini ram or accel runners?), custom chip, and was wondering what cam to use. Like to do cheapest way besides nos, power adders, or carb. Any suggestions?
TransAm223 is offline vBGarage Page   Reply With Quote
Old 03-03-2001, 12:57 AM   #2
Senior Member
 
Join Date: Feb 2000
Location: Fort Collins, Colorado
Posts: 1,196

Classifieds Rating: (0)
If your intake and heads flow well, get the LT4 HOT Cam or the ZZ4 Cam from GMPP. I got my LT4 HOT Cam for $184 with shipping from www.gmpartsdirect.com.

------------------
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!
Dan87IROC-Z is offline vBGarage Page   Reply With Quote
Old 03-03-2001, 01:36 AM   #3
Senior Member
 
JakeJr's Avatar
 
Join Date: Jul 2000
Location: Kempner,TX,
Posts: 1,014
Car: 1996 Vette / 1992 GSX1100F Suzuki
Engine: 1996 Corvette Coupe 388 LT1 (+.060)
Transmission: Auto
Axle/Gears: 3.07

Classifieds Rating: (0)
Send a message via Yahoo to JakeJr
That's a tall order, if you're talking rear wheel HP.

Getting 400 HP at the rear wheels from a 350 TPI engine MAY be doable, but, MAN, does it call for a lot of mods. Keeping it as a daily driver makes it just about impossible.

There are guys who are running 383s and 396s still trying to get that magic number at the rear wheels. You're talking close to 1.15 HP per cubic inch. That's an awful lot.

In order to do it you've got to remove all the L 98s flow restrictions and you'll have to rev the engine a lot higher than the stock redline; at least by 1000 RPMs. The easiest ways to increased power are to make the engine bigger or rev it higher.

You'll need a complete intake do-over by going with a MiniRam, TPIS's fuel rails, better fuel pump;

Full length headers will no or high flowing CATs and mufflers;

New camshaft; perhaps the CompCams 224/230 hydraulic roller;

1.6 Roller rockers

Air Flow Research 190 aluminum heads. Ported, stock heads won't flow nearly enough.

Vigilante converter

Higher compression; meaning new pistons with plasma moly rings.

Etc.

Getting that much from a stock short block, I believe is going to be a tremendous strain on the cast crank and two bolt block, not to mention the stock pistons if you opt to stick with those.

I'd lower my sights a little. Shoot for one HP per cubic inch in a daily driver. That's more realistic.


I've seen ads about 400 HP engines (which ads I take with a grain of salt), but I'll bet that's crank HP not at the rear wheels. To get 400 HP at the rear wheels, you'd need close to 500 HP at the crank.

Maybe someone else can chime in and give us all the magic receipe.

Just my thoughts.

Jake

------------------
1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9
JakeJr is offline vBGarage Page   Reply With Quote
Old 03-03-2001, 02:03 AM   #4
Administrator
 
IROCZTWENTYGR8's Avatar
 
Join Date: Jul 2000
Location: In a mint Third Gen!
Posts: 7,330
Car: Red 87 IROC-Z28 T-Top
Engine: 5.7 Tuned Port Injection
Transmission: 700R4 Auto
Axle/Gears: BW 9-Bolt 3.27

Classifieds Rating: (1)

Why do u want 400HP?? What times do u want to run??

------------------
Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.
IROCZTWENTYGR8 is offline vBGarage Page   Reply With Quote
Old 03-03-2001, 10:48 AM   #5
Supreme Member
 
91banditt2's Avatar
 
Join Date: Dec 2000
Location: Cincinnati,Ohio
Posts: 1,376
Car: 1991 BandittII Firebird
Engine: 5.7 Tune Port Injection
Transmission: 700R4
Axle/Gears: 3.27 9 bolt

Classifieds Rating: (0)

ZZ4 for $100 from http://www.sdpc2000.com/cart.asp?act...d=839&pid=8145

------------------
1991 banditt2 #130 of 600 http://clubs.yahoo.com/clubs/streetdawgracing http://y42.photos.yahoo.com/tonysams72. http:/discussion-board.com/GreaterCincinnatiFBodyAssociation
91banditt2 is offline vBGarage Page   Reply With Quote
Old 03-03-2001, 10:48 AM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > TPI

Tags
1986, 400hp, 500, 500hp, 57, camshaft, engine, hotcam, hp, l98, lt4, stock, tpi, tuneport, upgrade, upgrades
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 06:12 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details