TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Please post your best times for your base TPI set ups. Please include all your modifications especially modifications to your TPI system.
I have yet to run my car, just trying to figure out a great way to use TPI.
Also, if you have times for a setup that did not work out post that setup and time and tell us why it did not work out!
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I also do intake porting!!!!
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See signature. I'm hoping to lower the times quite abit with my next build up also shown in my signature. Should have the new motor installed sometime in November.
__________________ Best et of 12.12 and best mph of 111.27 mph. Motor specs as follows: 355ci, Dart Pro One 200cc heads, 10.72:1 compression, 8.5:1 dynamic compression ratio, TPI with highly modified 1st style SLP runners, moded GM plenum and First Injection TPI intake manifold, Mike Jones 228/228 cam, Yank SS3600 converter, Dyno Don 1 3/4" shorty headers with excellent Dyno Don custom exhaust, custom cold air intake, AS&M monoblade throttle body. Race weight 3760 with driver. Meziere electric water pump. Mufflex 3.5" exhaust catback. Magnaflow 3.5" muffler#12909. Kevin91Z Tune. 4L60E installed.
Standard correction/unlocked 380RWHP, 371 RWTQ. SAE numbers are 370RWHP, 361RWTQ. Switched to MAP. At the motor that is 462HP SAE.
A 370 cubic inch motor based on the Dart SHP block is under construction. Using AFR 195cc Comp Heads.
See sig. for specs and time. Still have lots of work to do in the tuning dept and have a Pypes 3" catback to put on yet. So times should improve...but you have to start somewhere In case the sig. is not there, the time thus far is 14.74@101.1MPH
Last edited by chevy385; 12-06-2006 at 12:19 PM.
Reason: 1/4 time changed
hooker comp with crappy hand made Y
2800 stall built trany
373 eaton posi (too much gear for now)
K&Ns
MSD 6AL
it still needs a good tune and i have some traction problems.
i dont see how you couldnt get a least some high 13s with those mods. do you have a stock cam?
14.4 launching at idle in drive with a 2.145 60 foot time to ditch the 2.77
__________________ Iroc MODS
Air/Fuel- Moddified Holley 650 Dual Feed electric choke vacuum secondary carb, Holley Street dominator high rise intake, mallory 3 port fuel pressure regulator, 14x3 Summit open element air cleaner. 6psi fuel pressure
Ignition- Summit HEI dist, Summit 8.0mm wires. 8 degrees of timing
Exhaust- Hooker 2055 headers and y-pipe, 3" MAC cat delete pipe, 3" Hooker catback
Transmission- S-10 2025 stall torque converter, Superior shift kit w/ vette servo, Energy suspensions mount, B&M super cooler.
Cooling- 180 hi flow mr.gasket thermostat, 195 jet fan switch.
Suspension- UMI tubular non adjustable lower control arms
It was rumored once that there are not many TPI's in the 12's. Looks to be true. I suppose the TPI becomes the bottle neck around 13's. What kind of times have people been running with siamesed runners and plenums? I am not looking to change the TPI a whole lot. I rather keep it some what TPI.
It was rumored once that there are not many TPI's in the 12's. Looks to be true. I suppose the TPI becomes the bottle neck around 13's. What kind of times have people been running with siamesed runners and plenums? I am not looking to change the TPI a whole lot. I rather keep it some what TPI.
while that may be true; it doent mean its hard. they have a guy at my local track that has a L98 with a ported stock base,ported SLP runners,edlbrock performer heads, and a Lt4 hot cam running 12.8-12.9s
thats a relively cheap combo.
I was running in the mid-12's last year (best is a 12.47 @ 110.31) with ported SLP runners and Edelbrock manifold. My engine is a 355 with TF 23* heads, LT4 HOT cam, 10.5 comp, Hooker 2055 headers, etc. With the stock runners and unported E manifold, I ran 13.5 at 100 mph but not much timing due to detonation issues.
The cam I have is a corvette l98 cam. I been wanting to do an lt4 but I am not sure if my aluminum l98 heads can take the lift.
Makes me wonder if a ported stock base could be just as good as or better than the edelbrock one.
My goal is mid 13's with my current setup. However I am getting a stock 700r4 to replace my T-5. It has a stock TC so maybe I should be thinking 14's?
__________________ 86 IROC R.I.P. 02/04/07 Over 20 yrs of enjoyment... reborn as an 89 IROC with upgrades like HSR,XR282 cam,AFR 190 heads,Random Tech cat-back etc
Hope so, I have never raced with an automatic before so I am kinda worried lol... plus I am sure it will help one day when I get a decent TC. But I sure hope a stock 700r4 can get the job done... on some 13's
Stock 200,000 plus mile 1987 L98 with a siamesed plenum and radiused runner entries, long tube headers with duals, gutted air box with K&N's, MSD 6A, Walbro 255lph fuel pump, and a de screeened maf was good for a 8.9 in the 8th 13.8 1/4, 150 shot got me an 8.0 in the 8th 12.5 in the quarter the same day. Installed an H pipe, and 1.6 roller rockers with NGK TR6 plugs and took it to the local 8th mile track got an 8.7 on motor, 7.9 on spray. Next round of mods includes a ported lower intake, LS1 injectors, and new prom; for the nitrous side, I'm moving up to a .073, .043 jet combo. I'll post times if I can get to the track once more this year.
When I had the tpi 305 in my formula it went 11.8's @112.xx 1/4 & 7.5's @90.xx with 1.5x 60's on a 160 shot & the one time I ran it on motor it went 13.2 @ 102. The combo was ported plenum, stock tb, edelbrock runners, tpis big mouth base, edelbrock headers, lpe 211 cam, 1.6 rr, ported s/r torquers, 19lb injectors, afpr, built 700 w/ a vigilante 2800 converte, 3.73 gear, dynomax super turbo catback, & 275/60/156 mt et street radials.
__________________ 87 formula
234cid girdled turbo buick pt70 p-trim, ported iron heads, 220in 224ex .579in 596ex, 1.65rr, ported intake, PTE plenum, 70mm tb, th350 rdneck t-brake, PTC 4200, jegster adj ta, jegster adj lca's, strange 12 3.42gear, pa racing tubular k-member, pa racing coilovers, 325/50/15 hoosier dr's, best 60ft 1.34, best 1/8mi 6.22 @ 109.61mph best 1/4 9.81@ 133.37
88BlackZ-51 You have a TPI in a vette correct? My car's got an almost garunteed 13.7 in it next time out and it has iron heads and a smaller cam than most TPI 350's. My motor still has stock intake gaskets on it so I'm about 99% sure it's completely stock with my own bolt ons.
14.3 @95 with a TPI350 and th700r4. othermods include SLP 1 3/4" headers and y. 3" hooker catback exhaust, hooker aero-chamber muffler. no AC and no AIR pump.
then the tranny swap
14.4@97 with TPI350 and WC-T5. othermods include SLP 1 3/4" headers and y. 3" hooker catback exhaust, hooker aero-chamber muffler. no AC and no AIR pump. poly-mount on the tranny, centerforce dual friction clutch.
both of these times were done in full street trim. no airing down, no drag tires, no brake bias changes. i have crappy cooper-cobra tires on imitation centerline 15" wheels (prior owner ditched the GTAs). car has stock 3.27 gears, PBR rear discs, and almost no weight reduction. with me in it it tips the scales at 3,360 LBS.
__________________ Member/Moderator @ www.cascadecrew.org
1986 base BIRD LB8_2.8L_V6 17.4@76MPH. mods:
4th-gen console, 2002 cavalier front seats, 140MPH speedo, completly de-cluttered engine bay, lots of "free" mods. complete front suspension and stearing rebuild. Custom Cold Air Intake.
1988 Trans Am GTA 5.7L TPI L98 14.3@97MPH. mods:
base model spoiler, 4th gen console, 4th gen charcol leather seats, free mods, 89+ rear disc brakes, SLP shorty headers and Y-pipe, full 3" hooker catback, WCT-5 trannsmission, centerforce dual friction clutch. COMING SOON: 4th gen doorhandles, custom transsmisssion crossmember, SFCs, 98+ front brakes.
88BlackZ-51 You have a TPI in a vette correct? My car's got an almost garunteed 13.7 in it next time out and it has iron heads and a smaller cam than most TPI 350's. My motor still has stock intake gaskets on it so I'm about 99% sure it's completely stock with my own bolt ons.
Yes I have the stock intake/head/cam from the general. I dont know what your point is? Its fact that the C4 TPI are quicker then the 4th gen F-body's in stock trim or mod for mod. My car ran 14.21 with no mods.
Hard to get a cam smaller then the stock cam dude.
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Quote:
Originally Posted by 1991CamaroRslow
88BlackZ-51 You have a TPI in a vette correct? My car's got an almost garunteed 13.7 in it next time out and it has iron heads and a smaller cam than most TPI 350's. My motor still has stock intake gaskets on it so I'm about 99% sure it's completely stock with my own bolt ons.
Are you happy if you get a 13.7? Will you break into the triple digit MPH?
Last edited by 88BlackZ-51; 10-24-2006 at 09:33 PM.
Reason: Automerged Doublepost
i been 13.79 at almost 97mph in hot summer night (80deg) on 26inch et streets 3.27 gears in the old 9 bolt rear. 1.80 60 foot. stock L98 with full exhaust and lots of suspension work. 2800 stall. its seen 100mph traps in the cold on street tires
been 1.79 60 foot with EST wire dissconnected and breakin the posi spyder gears on launch.... that would have been a bottom 13.7x or possible 13.6's
The only official time I have is from right when I bought the car 91 350 tpi/T700, stock exhaust manifolds(dual cats) Flowmaster cat back,hypertech chip 160 tstat, underdrive pullies,AFPR, most free mods. It Ran a best of 14.4xx at 97.2
I ran a 8.1 with a 1.687 60' with only 310 RWHP. ALL STOCK except the nitrous whih I only sprayed about a 70 shot according to dyno but according to pill setting it was a 150???????????? Of course I had the drag radials too. I launched the nitrous from the dig and stalled up my STOCK converter as much as I could and man was it fast.
My best run with the old TPI'ed L98 was a 14.3 @ 98mph. Mods at the time included descreened MAF, airfoil, ported plenum (IAC walls shaved), K&N filter, freshened stock L98 heads (hottanked, new oil stems, etc.), edelbrock shorty headers and y-pipe, no cat, flowmaster 80 series.
That was back in the summer of 02 or 03, can't quite remember??? Now I've gone to hell with it! Refer to sig!
88BlackZ-51 I hope it's just me but that post souded pretty hostile? 1987's came with a smaller cam than all the other years of Chevy TPI's and the Camaro's came with a smaller cam than the vette. Also NONE of my post was directed towards you except for the question about if you drove a vette or were talking about a third gen. No one on this board's being hostile to you. I was making a point that it's fully possible to get mid 13's from a bolt on TPI as long as the combination's set up right. As for breaking into the triple digits, It'll probably break 100 considering it's doing 98 now. I've broken into the triple digits quite well considering my 12.5 and 6 nitrous runs are in the 110mph range. The goal this time out is actually to break a 13.5 on motor, then to run an 11 second nitrous pass and drive the car home. I'm ready to attept it considering I'll have all winter to fix it if something crazy happens. This motor is OLD so it really owes me nothing now. It's done more than i ever expected it to, I paid 350 dollars for it from a junk yard, transplanted it into my RS and have drove and raced it every summer for the last 3 years. This engine has made me one firm believer in the power and reliability of the TPI.
1987's came with a smaller cam than all the other years of Chevy TPI's and the Camaro's came with a smaller cam than the vette.
Not entirely true. Any year, every L98 got the same cam. Although rumours abound that the 1989 L98 had a slightly meatier cam than the other years before the 1990 switch to speed density.
Stock internal TPI with headers/flowmaster/CAI/AFPR/airfoil with 3.73s on 28" street tires.....in a ~4200lb truck. I spun bad that run pulling a 2.4x 60' time. The next run I did a better burnout and got traction, but got wheel hop instead and broke a u-joint
I'll be back to the track in 2 years with my new combo.....looking to skip the 14s and 13s and head straight for the 12s
Looks like Greg is the winner so far with a 12.47@110.31. 2nd is a 12.71@107.65. These are NA cars. We'll see what the first of the year brings. Hehehehe.
awesome!! my goal is to get 13.49 or below on the stock head/cam/intake that the old general installed in 1987.
btw, i doubt there is much diff between an 87 L-98 cam from an 88 L-98 whether it be a camaro or a vette. there both really, really weak.
goodluck!
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Quote:
Originally Posted by 1989GTATransAm
Looks like Greg is the winner so far with a 12.47@110.31. 2nd is a 12.71@107.65. These are NA cars. We'll see what the first of the year brings. Hehehehe.
greg is the winner? i thought u went stock TPI? oh well, 110mph is movin.
Last edited by 88BlackZ-51; 10-25-2006 at 08:54 PM.
Reason: Automerged Doublepost
Looks like Greg is the winner so far with a 12.47@110.31. 2nd is a 12.71@107.65. These are NA cars. We'll see what the first of the year brings. Hehehehe.
Well according to my 1/8th mile time slip and my 60' I pulled and trap speed I should be close to second place
Directly from this site http://www.thirdgen.org/tech-data 1987 had a different cam than the other years, you can read it right there. It's not like I make this up to sound cool, I also agree all of the stock roller cams are weak. I got my lower intake off tonight, will be posting pics of it compared to the pics I just posted of my ported intake. This is off topic so I'll try and keep it on, I hope to shave 2 tenths with the ported lower.
I'm watching this thread closely to see if anyone puts down their numbers that matches the mods I have. Anyone dial in what I'd run? My mods list doesn't contain a converter but just for the record, it's a 2800 stall.
I'll be swapping my 10 bolt 3.23's out next year for a '95 Z28 10 bolt with mods out the yingyang including some 3.73's. How will these effect my 1/4, '60, 1/8 etc.
1987's came with a smaller cam than all the other years of Chevy TPI's and the Camaro's came with a smaller cam than the vette.
Quote:
Originally Posted by BigWhiteGTP
Not entirely true. Any year, every L98 got the same cam. Although rumours abound that the 1989 L98 had a slightly meatier cam than the other years before the 1990 switch to speed density.
Stock 305 TPI cams for 1985 to 1992. **Note the 350 TPI uses the 305 Manual Trany cams.
Well, then my car is a freak and so are the other guys that went to swap cams and pulled out L98 cams of their 90-92 auto/lb9 cars. Also, our dynos and track times are whacked as well. It's a GM conspiracy, they've gotten to all tracks and dynoshops to mess with us.
Truth is, that info is wrong and so are some of the tech articles. The only way to know for sure is dyno, track, and degreeing cams. All of which have proven beyond a shadow of a doubt that ALL SD TPI cars got the L98 cam.
I have heard that before, I cant say either way myself, nor do I trully care, the part numbers and info came straight from a GM tech, take it or leave it, no need to be rude about it
or try google, lol
Last edited by Hawk92z-TDZ; 10-29-2006 at 04:33 PM.
That stuff belongs in it's own thread. Not in mine. I am not trying to be a jerk but I do not want my thread locked. Please take your conflict elsewhere.
In case the sig. is not there, the time thus far is 14.74@101.1MPH 
87 formula 
oh well, 110mph is movin. 
