You know, I get sick of hearing all of the bull$!t slung by guys who couldn't tune an L98...It's like the mechanic who keeps on cursing his tools. .For those people they're better off with a car that's a little easier to modify, and drive.

I broke into the 13's when I didn't have much done to my car. A feat that many LT1 guys and even a few L98 guys said I couldn't do with the mods I had. Most of which I beat on the track, some I didn't race. I even shocked a couple of LS1 guys who were under the same impresion that TPI couldn't be made to run. I personally know of one TPI Vette RIGHT NOW that runs LOW 12's! with a decent cam and ported STOCK heads!
Money problems have slowed my progress on this my current project, definitely NOT my first. With the mods I have now(in progress, and have NO times yet)I will hit high to mid 12's. Then my sights are NOW set on 11's with the long runner TPI in tack...we'll see...

It's like this guy I used to know at the track who had a b!tch!ing 72 Monte 396ci. He threw all of this money at it with stuff like ; A Dominator carb, Brodix heads, Erson cam, blah,blah,blah...And he only ran a 13.7..........And blammed the motor,,,hahahahha!!!!!
I see it all the time, TPI guys can't run fast, and guess what??blame the motor.......

I tell ya what, I WILL get my TPI back together this winter and in the spring I'm gonna run it right up the @$$ end of all these **** talkers if I have to drive 300 miles......I'm gonna be at some events this year, count on it...me and my slow, suck @$$ TPI...

All EFI runners are tuned ports, chevy coined the name...
Chevy calculated precise runner lengths and diameters to use the rebound wave when the intake valve closed, so that it would end up back at the valve at a time when it could help push more air into the cylinder...not an easy feat.....By doing so it acts as a passive supercharger equal to aprox a 2psi boost...Where the TPI ends up being "More than a sum of all it's parts!!!"The increase in efficiency brings it right up there next to the Almighty LT1...

 

Ok, I know for a fact that the LT1 runners are 3 inches long. Anyone know how long the runners on the LT5 were? I'm seriously doubting they were shorter than an LT1. I know it's silly to compare, but I'm kinda curious now.

If an LT5 would fit between the fenders of either of my cars (and I had a spare $12,000+) I would darn sure have one there.

 

A properly matched head, intake, cam, setup witha good tune on a l98,ls1, or lt1 will yield about the same horsepower and 1/4 times..check out my combo and what it got me. The car has fulll interior and ac.
1990 L98 Formula
58mm TB
Hooker 2210s LTs
AFR 190cc Heads 2.02-1.60
TPIS ZZX cam 1.5 RRs
Stock Suspension except front swarbar has been removed
TPIS prom
TPIS miniram intake
22lb stock Injectors/Fuel pump
BEST ET : 11.43 @124.76 1.56 60Ft
I'd say this setup is about the same as any ls1 head cam setups.

 

I think you're full of it. There's no way you're pulling a 1.56 60 ft time on a 13+ year old stock suspension.

 

Why? I'm pulling 1.61 on Nittos. If I were to slap a better tire, I'm sure I could do at least that.

The ET vs. MPH is what I'd be concerned with. That doesn't make any sense with the short time.

BTW, we have bolt on LS1's around here that are running 11.5x. Granted they have a ton of mods but none has touched oil. Valve covers have never been off. They are tuned to perfection and have monster torque converters but bolt on none the less. Its pretty amazing what the LS1/6 can do.

 

Torque convertors and gears play a huge roll in quick ET's. Take my good freind who is a big Mopar man. A couple of years ago he blew his sweet, 10sec modified '68 steel crank/340ci motor, and to stay in the points running had to drop in a junky virtually stock 360 he had the leaked oil from almost every gasket. After adding a "Purple-Shaft" cam, his other intake and carb he still managed to click off high 10 second passes(10.93). Why? 4500 stall/Torque-Flight, 4.88gears, wide slicks, air shocks, removed sway bar and other cheap dumb stuff. This car hooks so hard that when on level ground, the drivers side of the car sets a couple of inches higher off the ground than the other.
I just want to see how fast I can go and still remain really streetable..

 

1. Stock for stock, an L98 3rd gen will run right next to a stock LT1.
2. The L98 is a better foundation to build on, than an LT1. More parts, cheaper parts, more history, many race series to drive technology,etc...
3. TPI sucks. Carb'd or Carb'd intake FI is the way to go.
4. L98 has a distributor, no opticrap.

Of course, in the end...I now realize I would have gone faster in a stang.

Lighter, cheaper, more room to work on motor, launches better...etc.

Steve

 

I'll say it again... All EFI runners are essentially tuned ports. They are all tuned to do a certain thing at certain RPMs and assist the intended engine's purpose. EVERY SINGLE ONE! TPI runners are tuned for low RPM torque. The LT5 runners are tuned for high RPM horsepower. Both tuned, just one named after it - that's all. Just because an EFI runner isn't designed for the TPI low end torque does not mean it isn't tuned.

 

If you're considering "tuned" to mean just, air speed, as a header, you'd be right to a point...

BUT, Chevy took it a step beyond that, to tune the "resonance" waves to assist in cylinder filling.
Similar to cam timing, using overlap causing Exhaust flow to suck in more fresh intake air having both valves open "briefly" at the same time... They're NOT the same, other intakes are tuned only for **air velocity**or usable rpm range, the TPI GOES BEYOND THAT, timing the return air pulse waves to push more air into the cylinder. To say they're the same shows ignorance of the true meaning of the TPI set up....
That's truely a "Tuned Port"...

I theorize that after the success of the TPI, the rest of the industry borrowed that labeling to mean any port FI motor.
I doesn't matter how many ways you try, you can't make applesauce with oranges..

 

Borrowed or original, it's all the same... {throws hands in air} I give up

 

I will take a well modded and tuned thirdgen over modded and tuned lt1 for racing all day. The only advantage I have seen on a 4th gen for everyday driving is gas mileage. Dont call bulhist on waht I am writing either. I have one of each third and 4th. I have had a 383tpi, 355tpi, stock tpi. My 88 Trans am ran high 13's with a flowmaster muffler skinnies up front, no air filter and a small 2500 stall. Bone stock it went 14.2. In an 8th mile a stock "in good running condition" 3rd gen will take an Lt1, and an Ls1 all day long. Trust me I have done it!! As for the 1/4 hte Ls1 will win hands down, but the with the lt1 it can go either way if both are in stock form. Ihave sen stockk lt's run high 14's and then I have seen some run high 13's. My curent 88 Trans Am runs 11's N/a with a small cam, afr heads, 9.5:1 compression its a 355 cid. Now that is the same as a heads and cam Lt1. I run 3.70 gears and a diff intake. The only thing I will agree is that the lt1 is easier to tune thatn the 3rd gen. I guess you can ay its personal preforance more than anything else. I will say that in my opinion though that the GTA was the best looking 3rdgen period! and a 91-92 z28 is better looking than a 4th camaro. The WS6 LS1 is one badd azz looking car though!!! it is the best looking 4th gen there is.

Drew


__________________
Andrew
87 Trans Am GTA
88 Trans Am WS6
92 Firebird
94 Camaro-Z28
82 Diesel Suburban "The Tow Beast"

 

i know this doesnt add to the thread but i must say wow man
let me ask how you are able to own so many cool cars,
thats so many, how old are you and whats the insurance like? haha
and i def agree with you about the trans am bein the best looking 4th gen, im more of a camaro guy in my heart and i tend to like the thrid gen camaros better but when it comes to 4th gens, the trans am blows away the camaro in the looks department, im not a big fan of the camaros chrysler syle lights especially.

 

I am 29. I have owned my gta for 7 years, my ws6 for almost 3 years, the 92 is my fiannces', and I just sold the 94 z. My insurance is fairly cheap about 900 every 6mo for everything.

 

I get a lot of crap about owning a 3rd gen, but I dont give a crap. I love this car and thats that. Sure its not the fastest, but it sure looks nice. For speed, I drive my Vette around

 

To me the third gen Camaro is better than the fourth gen from a looks standpoint. On performance well the 1998 + LS1 V8's take the cake. No stock L98 will touch it (But that doesn't mean a modded one won't ) Also I love my 3rd Gen Camaro it may be a 5.0 and not a Z28 but it looks good is pretty damn quick and leaves me with a smile from point A to point B. I feel that if you have a 3rd Generation Camaro you are privilaged to have one of the best of the best of the F-Bodys. These cars are becoming classics and stand out more now then they did 5 years ago. Essentially guys no matter what the 3rd Gen is still cool will still turn heads and still put a smile on your face.





That's Just My Opinion.................I could be wrong

J-Byb