TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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No strokers, NO2, or turbo/superchargers.
(over bore ok)
Still have the factory style TPI intake (aftermarket runners ok) NO HSR SUPER RAM
List you mods and times please.
thanks
Corrected to sea-level I should be around 13.3-13.5 @101-102...my exhaust is killing me and tuning is not known. I believe my CR is 9:1 as well
My UNCORRECTED times at 5000 DA were 14.3@96mph--To give you some perspective...LS1 6 speeds run 14.1 up here from what I can tell. LT1 cars are high 14 sec cars.
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__________________ 89 Formula 350 Arctic white T-tops
SDPC Vortec intake, Edlebrock E-Tec 170 heads, TPIS ZZ9 cam, 1.6 Crane gold rockers, SLP runners, SLP 1 3/4 ceramic coated headers, B&M 2400rpm stall, Magnaflow 3" cat-back ect ED MILLER LS1 front brakes
Last edited by avro206; 01-26-2008 at 07:07 PM.
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In signature. Should easily get into the 12.4's with current setup. Maybe 12.3's with ideal weather conditions. Currently doing some upgrades for more power. Then we shall see.
__________________ 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.
the 1st ratio is static the 2nd is dynamic both are quite essential to a good overall build.
static is what you're use too i'm sure. dynamic is a lit more complicated and i don't have a perfect definition of it for you so i'll let someone else chime in
Exactly. Static is the compression ratio most often seen. Dynamic is the compression ratio after the intake valve is closed. This is usually after the piston is already on the compression stroke. So that is why the number is less than the static.
I ran a 12.91@105 a week ago at Prairie Hill. Here is my break down. I also ran a 12.98@103 at another track back in September.
1991 Z28 355, A4 with 2200 stall converter, factory 3.23 gears. Factory smog and A/C.
Weight Reduction:
Fiberglass hood
3 1/2 centerline warriors in front
15x8 centerline warriors in back with BFG DRs 275/50/15
Removed passenger seat
Racing seat for driver
No exhaust
Engine:
.30 over stock crank and rods
hyper pistons with ARP bolts throughout
Factory uptouched 113 aluminum heads
port plenum only TPI
factory runners
factory intake
1.6 roller tip rockers
LT4 Hot Cam
K&N filters in front
30# SVO injectors
Tuned by me
Hedman shortie headers
Chassis:
Poly bushings everywhere
Boxed lower control arms
No front sway bar
Hoping to hit 11s with a 150 shot. I think my DRs are about done. Buying some slicks this weekend but will probably trashed my rearend. It is factory by the way. I have the timeslips to prove it. These cars haul *** if you know what you are doing. I get tired of the 4500 rpm limit BS talk.
13.6 was best i could get bone stock L98 with full exhaust/2800 stall/3.42 gear. Buddy's L98 with aftermarket base runner, stock converter/3.73 gear on street tires ran 13.59 i think..very quick L98
I ran a 12.91@105 a week ago at Prairie Hill. Here is my break down. I also ran a 12.98@103 at another track back in September.
1991 Z28 355, A4 with 2200 stall converter, factory 3.23 gears. Factory smog and A/C.
Weight Reduction:
Fiberglass hood
3 1/2 centerline warriors in front
15x8 centerline warriors in back with BFG DRs 275/50/15
Removed passenger seat
Racing seat for driver
No exhaust
Engine:
.30 over stock crank and rods
hyper pistons with ARP bolts throughout
Factory uptouched 113 aluminum heads
port plenum only TPI
factory runners
factory intake
1.6 roller tip rockers
LT4 Hot Cam
K&N filters in front
30# SVO injectors
Tuned by me
Hedman shortie headers
Chassis:
Poly bushings everywhere
Boxed lower control arms
No front sway bar
Hoping to hit 11s with a 150 shot. I think my DRs are about done. Buying some slicks this weekend but will probably trashed my rearend. It is factory by the way. I have the timeslips to prove it. These cars haul *** if you know what you are doing. I get tired of the 4500 rpm limit BS talk.
if you got 12.9s then i should be mid 12's with my setup.... i know ima 12 second car...
i know.. i updated my sig.. got some new parts so im almost ready for the track... i need to get timeslips for my build....i was invited yesterday to go to benson with my friends mustang, vette and gto but my u joints need to be changed... changing them out this weekend....
high i have a 1991 rs with a carberated 350 out of a van it has a 750 cfm flowmaster single chamber muffler no cat my uncle wants to race me for 100 bucks in his bone stock 96 impala ss should i pull it?
posted in the wrong forum.... but i think the impala would win... but you may have him being your car is a little lighter..those impala ss have the iron headed lt1 engines..... ive heard that the iron heads outflow the aluminum counterparts im not sure about that tho.....
I have a 355, 2.02 (made from 1.94 stock heads) heads, summit cam and lifters #K1106 292/292, Lift .488/.488, flat top pistons, stock rods and stock rockers, fully stock, unported TPI. Backed by a TH350 (no speed sensor yet)
12 Bolt 3:73, Aluminum 3.5" driveshaft. Currently using 29.5" slicks.
The car has a rollbar and stock driver & passenger seats.
Best pass was 13.91 @ 98.14 mph.
I would like to get this car in the low 13's without taking the intake off (as in no mods to the base. I still need to cut the screens out of the MAF, add some kind of self built CAI. Do you guys think that with the two above mods with going to 28" tall tires will get me there? What tire size are you guys using? BranZ lists his but I don't see any one elses?
I have a Hughes 2500 stall in it. When I built the engine, I wasn't entirely sure that I was going to stay with TPI. That is why the choice of carb. If I can get this in the low 13's I am going to keep the TPI and be ok with it. If not, I may end up going carbed. I want to stay with the TPI though for a couple of reasons.
1. I already have it.
2. Everybody at the track uses carb.(For a good reason).
But fuel injection is supposed to be more consistent is it not?
I will be going to 28" tires for the spring.
This winter I am going to do all the cheap and free mods I can find. Any and all suggestions are appreciated along these lines.
I still need to do the IAC and the TPS mods too.
that cam is a mismatch for the tpi and a stock tpi at that. if you had a ported edelbrock/slp tpi then it would be alot better... a fully ported out slp/edelbrock tpi should mimick a superram.... that cam u got there peaks at 6200 which the stock tpi peaks around 4800-5000 and is killing alot of that cams potential power.... also some suspension mods like lcas and lcarbs and and a torque arm would really help putting that power to the ground...
I forgot to add that to my list of items. It is a Moser 12 Bolt with Moser adjustable control arms, adjustable panhard rod and torque arm. I shouldn't trouble making it stick.
How much would a guy have in the slp/edelbrock setup?
in that case your suspension looks real good.... its the tpi thats the bottleneck of your combo... if your asking how much it is it depends.... retail the slp runners will set you back around 350.00 and the edelbrock intake is another 400.. so about 800 with shipping... its not cheap and there are better intakes that are cheaper but the looks of tpi cant be beat in my opinion.. the tpi can be made to perform very well.. i dont have dyno numbers or times slips on my new build but my car feels unbeatable from 0-70 honestly which makes for an excellent fun daily street car.. but i got mine on this site a couple years back for around 450 total...... i then ported it out myself for even more flow.... also you didn't mention if you had a tune... are you still running the stock tune... if so thats killing your combo also....
Car will go low 13's if you get your 60 foot down where it should be with that setup. You have good tire/suspension and enough gear/converter to hit 1.7x 60's. What are you currently running on the 60 foot? From your trap speed and ET, i would guess low 1.9's
also noticed you had the stock stamped steel rockers.... i would think roller tips would help like the pro mag 1.5 rockers..... the stockers go anywhere from 1.39 to 1.52 so they are not always constant and they are not so great either..... either way you should be going faster than what your running..... this is just my opinion but the 373 and tpi isnt the best... tpi has gobs of low end torque..use that torque to move the gears..... 3.27-3.45 gears would suit it better... i know you will start off like a rocket but you'll quickly be running out of gears by the time your at the end of the strip with tpi..... isnt that th350 a 3 speed.. again just my opinion...
I also have no exhaust at the moment. I am guessing with 28" tires, exhaust and maybe some rockers I can get some good time slips.
The TH350 is a 3 speed. The above time slip I shifted at about 5000.
yeah 2.0 60 foot for 3.73 gears/slicks and 2500 stall is horrible
With TH350, you can get away with 3000 stall for that setup. 3.73 gears are good enough, especially with 26-28" tires.
Either way you need to get that car off the line faster. I assume it isnt spinning? how much timing do you run just off idle through 3500 rpm? Look at your WOT timing and bring max timing in at 3000 rpms. Ramp up to 3000 rpm from low rpm fairly quickly. Should boost your torque
It is not spinning as far as I can tell. At the moment I don't have any way to look at my numbers as far as tuning goes. I have been emailing a guy about some equipment to tune and burn with all afternoon. Sounds like a decent deal.
__________________ '86 Camaro IROC
350 with Comp Cam .480/.495 lift 212/218 duration, Vortec heads, Edelbrock Vortec TPI baseplate and Runners, 700R4 with Shift kit Long Tube's with custom Y-pipe into 3" Flowmaster, and 3.27 Borg Warner gear with Disc. Runs 13.41 @ 102mph with 1.918 60' on a Street Tire.
slp are good runners, LOADS of room for porting and/or siameesing. i cant really comment on the other brands. slp runners are somewhat heavier than stock runners and it seems ive lost just a bit of low end torque but gained a bit of upper rpm bhp. my stock intake is really choking me at the moment, if you get runners i think its best to save and get the intake at the same time.
May years ago when I still ran the long tube set-up this was my combinatio and ET.
355, 10.25 CR, ZZ-9 cam, 195 Trick flow heads, 1.75 mac headers and cat back, TPIS base and large tube runners, custom tune, 2300 stall.
Best ET was 12.69 at 107 MPH noncorrected.
__________________ 1988 Formula 5.7L/6sp 3.91 gears,10.6 cr, SLP cold air kit, MAS gutted, TPIS air foil, TPIS AFPR, Superram, MAC headers, Mac under drive pulleys, MAC cat back, Relocated MAT, E-Tec 200 heads, SDPC Vortec manifold, ZZ-409 cam.
Best ET 12.17
Best 60 FT 1.754
Best MPH 113.1
RWHP 369
RWTQ 399
14psi, street tune 
355 TBI/WC T-5/ 9 Bolt 3.27 Posi w/PBR's, Edlebrock headers, MSD iginition, complete WS6 conversion, open element, energy suspension poly bushings throughout, complete A.I.R. delete, 8mm wires, 165* stat, 4th gen T/A wing, all black leather 4th gen interior, Custom circle grid T/A tail lights, Sequential turn signals.
