I want to keep the TPI and use the stock heads, ported of course. I have a 30 over 350 w/ 10:1 forged flat tops thats already been prepped. Is this possible ? Anyone already doing it ? I don't want to s/c it, but NOS isn't a problem.

If NOS is not a problem...Thats the ticket...High 12s, possibly mid 12s without it with a good prom...Tom

It is possible, like 1 in 100,100. The stock heads are crap. TPI is not a speedy go fast system. It will be loads of fun in town, but not 11s. With a 6 bolt block and GOOD rods and accessories and ALOT of NOS you could do it, maybe a couple 500 shots.

Get a 350 TPI to run in the 12.90 to 13.00 range, and a 150 shot will put it in the 11.80s....

You don't do alot of reading do you ? If there's guys out there with stock bottom ends running low 12's, why wouldn't it be possible to break into the 11's with a built bottom end? If I can get into the mid 12's with the stock ported TPI setup, I'm sure a 125 or so shot would put me under the 12 sec mark. If I absolutely have to, I guess i'll have to save up for a set of heads, but I think this is possible.
Maybe i'll just put "a couple 500 shots" on my Schwinn and run 11's.
Is anyone running the stock TPI with ported heads? If so, what other mods and what 1/4 times ? Thanx, Chris

A 350 TPI could run 11's..its been done...using the stock heads ported I have not heard of anybody doing it.
How well does the stock heads after some porting flow? L98 Aluminum can be ported to flow 250+cfm's...if you can get the Iron ones to flow decent(although you can't always say a certain cfm will make a certain amount of hp) plus a balanced cam/stall/suspension setup..its possible.especially with good tires/slicks.
It would be all on traction/60ft...

BTW...mid 12's with a 125 shot would get potential mid/low 11's.
I think you could get into the 12's with all the usual bolt-ons and a good cam swap...ported heads,even the stock ones,would get you even further.

Good luck...I'd like to see you do it.

I would love to make a suggestion on this. I want to ask a few questions first before i jump the gun.

355 c.i.
Stock crank?
Stock rods?

10:1 is slightly high to spray it taht much, but if you have forged rods and a recon. or aftermarket (GM Forged) crank then thats great. 11.99 imo is fairly possible as long as you pay attention to the small stuff

Kevin91Z, Mike Davis and 1bad91Z are the only people who I know of who have gone in the 12s with a TPI set up, and that was high to mids. They all had aftermarket heads, bases, runners, cams, and tons of other stuff.

Who are you guys reffering to that is getting all of these great times? And if a good cam, pistons, suspension and base will get you into the 12s, why isn't every body else running 12s? And then 11s? I know of people on these boards that run 11s, but they have lots of parts that were made for going fast. IE AFRs, mini-ram, stealth ram, Performer RPMs, superchargers.

There is also the current thread of "12.99 possible with STOCK heads,cam,bottom end and N/A? " This is a good one that may help with this subject.

If that's the same thread I read it's about a 305 (correction 350.) A long and interesting thread.

Bri3212, yes, it's a 30 over 350 that's been line bored, honed and all that good stuff. I'm not sure about the crank, but it's got forged flat tops and pink rods. Everything in the block is fresh.

Anyone got a positive response or info that can help me ? If it absolutley can't be done, i'll find out for myself and go from there.
This is a personal mission to beat my little richie rich cousin w/ a 00 GT that just bought a procharger so whatever it takes is whats gotta happen.

Traxion went mid 12's with long tube runner also,and I thought Mike Davis broke into the 11's with his(not sure)...
Thirdgen's come with the least from the factory,when compared to LT1's/LS1 but have alot of potential...The avergae thirdgen owner is between 16-21..alot can't afford what it takes to run decent #'s....There are a ****load of TPI vettes running good times with long tube runners...I realize the vette is not exactly setup like an f-body...but the point is the vette boys have $$$ to make the TPI's run...I have seen so many mismatched setups on this board over the years its not funny,because corners are being cut for $$$ reasons.
No offense to anyone...it takes money to run,all there is to it.
Plus these cars are getting old..you buy one usually you end dumping a ton of $$$ into it to just get it to run right...like the brakes/tranny..there getting old...believe me..I would have had a freaking 10 sec ride by now with all the $$$I've dumped into the interior/brakes/tranny ect...now I'm getting it repainted,because its looking rough...the group that can afford these cars...really can't afford them...why you don't see enough good running ones. And the people that can afford to buy and mod a thirdgen right...why would they want to start with (on average) high 14 second or slower car...when they could start with a low 13 sec LS1 and put it in the11's easily..plus an new LS1 isn't falling apart like a lot of thirdgen's....it takes someone with deep wallets and the desire to mod a thirdgen right to get them to run good.


Yes I think you clean up you stock heads/cam the car right/do the correct exhaust/ intake mods with good traction, tune it right/and a shot of N20 if need be..and I think its more than possible to reach your 11.99

With all of this being said about Corvettes, everyone needs to remember that it is partly due to the lighter vehicle weight and independant rear suspension. There are many other reasons but those are what comes to mind. Mike Davis got 11s on the HSR and Traxion did not get below 13s on the TPI. The question needs to be changed from how can I run 11s to to how can I make this set up better. Everyone knows that it can be done and it will take alot of money in places other than an engine. But no one has done it because of the increase in expenses compared to a better flowing set-up. It can easily turn into a 305 Vs 350 style argument. Do some searching on what other people have run, even a mismatched set-up can be fast. If you exclude my friends and family that own the Vipers, Lamborghinis, Mercedes, etc., than the people who have the fastest cars are the 18-25 year olds. They are the ones who do not have a family to provide for= more car money.

Not true. I own Tim's car now, and as I understand it he ran mid 12's on a perfect day with LTR TPI and many more mods.

I'm sure he'll correct me if I'm wrong, however.

http://www.bescaredracing.com/iroc/default.htm

https://www.thirdgen.org/techbb2/sho...threadid=47589

BWAhahahahaha. NOT TRUE. I ran 12.5's with no tuning, a converter smaller than Mike's, headers smaller than Mike's, injectors smaller than Mikes (still the stock 22lb'ers!), and a cam smaller than Mike's. This setup would have easily captured low 12's ... easily. Could it have gone 11's? Yes. It just needed tweaking and some different parts (converter, injectors, etc). It was a cool setup.

A fairly balanced TPI setup can easily go mid 12's without even trying. If you are having a hard time believing that a modified TPI setup won't go 12's easily then you have some learning to do ... because a really really good balanced TPI system with VERY good heads and a healthy matched cam can be knocking on the door to the 11's. You just have to know what you are doing ... and a lot of people here don't know what they are doing.

Tim

I guess that I am one of those people then so I will stop talking.

Brother ...you give me hope for mine PM sent Traxion ...hopefully you can [i] maybe [\i]give me some pointers

E/T's are more of a traction and weight issue than a peak power issue.

If you really wanna compare performance of an intake, look at the trap speed .

I'm not sure why Tim is promoting a TPI setup. I really don't. Its not a nice, or a sweat, or a cool setup.

I don't have a hard time believing a modified and expencive TPI setup will go 12s. I have a hard time believing someone actually would suggest it over the numerous and superior aftermarket setups of today.

When you add up the costs of the components, and porting, you'd be silly.


-- Joe

Stock manifold can only flow up to 342hp without changing cam and heads, toss on a carb much easier

I don't think anyone is promoting TPI over another specific setup...just that it can be made to run better than what a lot of people give it credit for,with basic understanding of the setup..

TPI has become very popular with custom street-rods...I think a long tube runner setup that has been powder coated a certain color looks pretty good...TPI is good for stoplight-to stoplight fun...some people just like having lots of torque and doing a monster burnout on demand...I agree though that if you really want to go fast there are better options...the big thing I hate about Long tube runnersetup(aside from running out of steam at ~5000rpm) is how it just loses tons of power during the summer months...of course in the winter it runs like a bat out of hell...but all motors pick up with cooler air.

My tpi setup used to get tons of heat soak too..

If you read what he wrote, IMO, it doesn't sound to me that he was promoting the TPI setup over the MiniRam...after all the MiniRam is the intake he chose with his car and he is a fan of converted single plane manifolds, too. He was merely correcting misinformation, I believe. :shrug:

Well the other most important ordeals your going to be up against is getting your car to launch(traction) and susspension upgrades to get the times you want. The power can be made easily with NOS.
It doesnt matter what style intake you are using if your shoving NOS down it or forced induction .
I have a buddy who has a 88 iroc running 10.90's on a stock motor.. The only thing he replaced were the stock valve springs since they float at high rpm easily and 24 lb injectors.
Of coarse he is shooting a 150 shot off the line and has a 12 lb procharger to scoot him the rest of the way. Point to be taken his bottom end has stayed together and his tpi intake has only been slightly ported.

Ok, the bottom line is I;m trying to work with what I've got and make the best of it. I don't have buku bux to dump into a monster motor. As it is right now, I have one of the LT-4 heads off my TA sitting under my toolbox at the shop because I broke a piston and rod. That is my daily driver and with Christmas just past I can't even get that back together yet. Anyone could say "
oh yeah just buy this manifold, this intake, these heads, this cam, etc. etc." but show me the money and i'll gladly monster garage the "ROC". If someone has any parts that would help me for sale cheap lemme know. I still have a BRAND NEW bare set of LT-1 heads that I can't find someone to buy.

Then fix your daily driver, and save up to make your car an "11 second car".

-- Joe

The good news theres a guy selling a long block 350 in the classifieds for 750 dollars..
Post an add for your LT1 in there as well.
The bad news it cost to go fast But if its somthing that you want and your determined eventually it will happen.
Buy a second car(junker) for cheap so when your project car is down your not sweating bullets all stressed out and with out wheels.

Another block wouldn't do me any good. I have something other than my IROC to drive, but it's broke right now. I need pistons & rods for an LT-1, but I don't want to go with a stock replacement. I already have 2 shortblocks. 1 I'm going to sell to but parts.

Tell me,,, just how much HP do you think the stock heads and cam will make?

Also,, have you yanked many TPIs to put on a carb? Everyone that I know that did this on their stock or near stock TPI cars back in the late 80s slowed down.

There is another guy in another thread that says his race teams 305 is a 600 horse power engine, with the stock heads. But that is with huge cylinder head surgery.

I thought you were going to stop talking.

Just kidding.

The point I was trying to make,, with his own numbers,,, is the TPI is fine for a 350 with stock (untouched) heads and stock cam.

I expressed my opinion on the subject. I do not think most people are capable of making or paying someone to make an 11 sec TPI car. It would take work to make the stock heads work with the TPI set up. I am with Anesthes on this.

The reasoning here needs to be a lil more realistic since Dehoyos is just trying to get his car running to beging with..
Like building a mid 14 second car to get into the 13's.
and as opportunity's along with cash flow become readily availble so will your power.

can get a TPI to got low 12's one bigger inch motors (383+) with stock bodied camaro

to get elevens it will be hard, with everything coming down to tunning for most power as possible and great suspension and slicks.

else your gonna need to cut out some pounds from the car. get it down to vette weight, or under. should be about under 3200lbs as it sits. then with you in it, you are gonna need a sick launch and good power

i would suggest competittion ported AFR 180's or 195's with high lift cam with duration good enough for power up to 5500 rpms. something like maybe a LPE 219/219 cam or similar (larger with more cubes you got) with 1.6 ratio rockers. then get SLP runners are AS&M siamesed runners, SLP ones ported to hell, maybe extrude honed with matching ported aftermarket base, extruded honed would be nice too. strong bottom end, maybe lightweight components to help it rev and free up power LOL

once you got the gears and suspension issues down, you should get low low 12's and 11's with some lightening.

BUT once all that is done, your gonna spend a pretty penny for that TPI stuff. Just get a super ram and go 11's easily on a 383 or even 355 or so. or even a stealth ram.

Rob, what do you mean " I'm just trying to get my car running" ? The IROC already runs with the stock 350 in it. It just has 190k miles on it. The TA is not running cause I broke a piston & rod, but thats my daily driver. The IROC isn't tagged or I'd drive it to work till I get the TA fixed, and with as many points I have on my license I'd never afford the insurance.

Naw bro I was just making trying to make a point that if moneys a problem maybe you shouldnt be considering dipping into the elevens.
Seeing the record you have maybe you should be in the Building brakes forum asking how to get a car from 120 to 55 in less than a second.
Sorry if I offended you it wasnt intentional..:lala:

No offense taken, I just thought you thought I was trying to get the TA into the 11's. Which would probably be easier to do. I'm looking into getting some aftermarket parts for the IROC, like a mini-ram or something. If I had a better intake with the stock ported heads, how much closer to my goal would that put me ???

You would probably still be in the 14's . I placed some 2.02 edelbrocks on with 64 cc chambers that I mildly ported (unshrouded the valves and opened the exhaust slightly and smoothed out) and totally gutted the inside of my stock TPI intake and ran 13.30. I was racing slightly modified LT1's and LS1's and beating most of them .