Im putting a 6262 custom kit in my car this week and am still on the stock motor(motor has 15k miles on it). I have driven a car with the same kit on it and its damn laggy obviously but I love the top end. Im looking to start piecing together the internals for a bottom end for it and am wondering what CR I should go with? I only run E85, the cams I have now are the kelford 272's(its a VIII) and the 6262 is on the larger .84 hotside. I would like to get it to spool a bit better then it does on my friends car thats running about 8.0-8.4:1CR and kelford 272/280 combo on his IX.

My options Im thinking is a couple things.... 10:1 and run the smaller .64 hotside, 10.5:1 run the smaller hotside but go to larger cams or just a kelford 272/280, 11:1 and run the larger hotside????? Just trying to get a game plan down so any inpu would be real helpful... TIA

 

As far as your projected build is concerned, what displacement motor have you decided on? I am probably wrong but, to my criteria at least, increasing the engine`s swept volume will have a more direct impact on turbo spoolup than an increase in the static compression.

The cam choice too. Your friends 272/280 combo might seem radical on a 2-Liter, while on a 2.4 stroker, the same camset will most likely seem quite mild.
Likewise the turbine housing choice such as the .64 might be necessary on a 2-Liter to spool the 6262, but on a 2.4 Liter engine a 1.06 might be better.

FWIW, I just think that increased displacement will help you spoolup better than increasing the compression ratio by itself.

 

2.0L for sure.. I want the revs for what I do with the car I need the top end. Spool isn't a real big big concern, just trying to find a nice middle ground is all.

 

I have to agree with Sparky on this one. A lot really depends on the motor size. The 2.0 272/280 would be okay however on a 2.2-2.4L you would want a 288/288 cam w/ 12mm lift. The 2.4L likes to breath and you need the larger cams for that. On your setup I would suggest looking into doin a 2.2 Long Rod with a 94mm crank and a 159mm rod. That way you can still rev to 9k and be stroked at the same time.

Regardles of motor size I would not go below a 10:1 cr. 10:1 seems to be perfect, once you start going above that you can start running into longivity problems. Honesly I would never EVER go above 10:1 on a street car. Some people do a 10.5:1 but honestly you want a safe and healty motor. I would stick with 10:1. The higher compression will really help your bottom end power a lot.

Let us know about a motor build choice. I would honestly look into the 2.2L Long Rod and give Aaron at English Racing a call. It is the best motor out in my opionion and would be a perfect match for a 6262. I wouldn't go 2.4 on a 6262. It will help spool but then again you are limited to a safe 8k. The 6262 wants to rev to 9k

I'm doing a long rod 2.4L but I will not be taking mine over 8.5k.

Let me know if you have any questions.

Mikey

 

Here is your middle ground. 10:1 2.2L Long Rod 4G64.

94mm Crank
159mm Rod
Custom HD Pistons
Fat *** 288 Cams

The Long Rod 2.2L Will rev to 9k and will be a great motor for a 6262 giving you more stroke than the 2.0L but you can still rev pretty high Best combo. My good friend Eric R/TErnie is doing the exact build with his 6262. I expect he will chime it

Mikey

 

im pretty sure the two exhaust options you listed you ment 63a/r and 82a/r the 63 would give you alot of mid range but ive even seen dyno charts on here that have showed the 82 spool just as fast as the 63 on a 35r i think it was ill dig around for the dyno chart

 

Honestly I would run a 82. unless you want mad power and lag out of the 6262 then you could go larger but a .82 would be a perfect setup on a high compression 2.0 or 2.2L.

Mikey

 

It's a vband setup and they are actually .64 and .84 hotsides.

 

^ then .84 it is

Not interested in a 2.2L long rod?

Mikey

 

I wouldn't run anything smaller than a .84AR. If you want to run a smaller turbine housing than that... get a smaller turbo.

Who makes the v-band turbine housing? Precision? Do you have pictures?

 

Eric, do you know Jim Aaron's friend that has a HTA3586? I think I might get a larger FMIC and I can't remember if he has the ETS 4.5" Garrett FMIC or what size Garrett he has. I know it is bigger than mine though.

Mikey

 

Oh Snaps!

 

I dont have pics of the actual turbo but it is a precision turbo.. heres the manifold... Its a reverse mount setup with the intake run into the passenger fender area. Its a custom setup from FullFunction and has already made great power.

 

That`s cool Steve! What exactly is your application anyway? Is it RR, 1/4, Auto-X, HillClimb, etc. Just curious. Wow, it just dawned on me that with the 6262 on corn fuel you`ll be needing really big nozzles. Like the showerhead 1450`s or more, huh?

 

I will be running FIC 1450's for now until the motor is done... My purpose for it is just a fast street car at this point... Cant really speak in depth on this forum about what I do with it though, but basically I want the car to trap high and pull hard up top. I just dont want it to be a complete and total pita to drive around town. Im not overly concerned with "when" boost comes on, as Ill be able to break boost or use the 2step, but from light to light and in traffic Im thinking that the higher compression should make life a lot easier to deal with....???