jim wolf tech with gt2871r questions!

[running_sideways]

finally got my sr20det bottom end done. thank god! but I've got a few questions about the top end set up. im going to drop some dough on a good snappy response going to get a new gt2871r .64 and i was looking at cams EVERYONE and they'er brothers always talks up jwt cams. really looking on getting the s4 but is this really the best results for gt2871r or should i maybe look at tomei hks. just looking for the best bang for my buck and dont wanna waste money on something that wont give me the best results. i wanna use this engine for scca and some close circut races. thanks for your opinions and if anyone has this kinda cam and turbo combo meal with fries hows your results???

[derass]

A better place for this discussion would be here:

http://zilvia.net/f/showthread.php?t=124925

But quickly, JWT S3 or Tomei 260 would be a better match.

[Tom N]

I personally like the power band Tomei 256/260 combo makes on small frame turbos but at the same time I don't have experience with any JWT came.

[Jorgs_7]

Running GTX2871R .64 w/ JWT S4 cams.

No dyno numbers yet, however, I went with this exact set up because of proven 400 WHP results and lots of research.

[henubem]

this exact set up because of proven 400 WHP results and lots of research.

[Kingtal0n]

A stock engine will hold 350. You went through all the trouble of building the bottom end for an additional 30~ horsepower? Why on Earth would you use a forged piston with a bottom mount T-25 turbo? I keep seeing people do this and its making me crazy. They come back in 5~months saying their $5000 bottom ends failed, leaving me wondering who is doing the math?

Forged pistons are for, you know, more power. 500 at least from a top mount, blanket, methanol, 93. You dont drop a forgie for 30 or 40 extra horses, you do it for 150+

[Tom N]

T-25 or T-2 framed?

[Kingtal0n]

Originally Posted by Tom N

T-25 or T-2 framed?

I dont even care what back side. I am just saying a stock engine supports a 38 or 40lb/min turbo, so why would you go through the heartache of installing forgies only to run a 44lb/min ?

A forgie should take you to 55+

[running_sideways]

Originally Posted by Kingtal0n

A stock engine will hold 350. You went through all the trouble of building the bottom end for an additional 30~ horsepower? Why on Earth would you use a forged piston with a bottom mount T-25 turbo? I keep seeing people do this and its making me crazy. They come back in 5~months saying their $5000 bottom ends failed, leaving me wondering who is doing the math?

Forged pistons are for, you know, more power. 500 at least from a top mount, blanket, methanol, 93. You dont drop a forgie for 30 or 40 extra horses, you do it for 150+

Dropped a valve put a hole in number 3 cylinder. If I'm pulling it apart I'm going to up grade some shit. It's not like I tore the hole thing apart just for the hell of it.

[Tom N]

Originally Posted by Kingtal0n

I dont even care what back side. I am just saying a stock engine supports a 38 or 40lb/min turbo, so why would you go through the heartache of installing forgies only to run a 44lb/min ?

A forgie should take you to 55+

I don't disagree with that. Unless you know you will be upgrading in the future. Who doesn't do that? The quest for more hp never ends.

[Jorgs_7]

Originally Posted by Kingtal0n

A stock engine will hold 350.

Probably would agree based on the SR history.

What about heat soaked track days and serious abuse? I don't blame you for putting better pistons in.

[running_sideways]

And 5k for a bottom end...haven't spent that much on everything I've got with new piston, rods, bearings, oil pump, timing chain, all the machining I have done. A lot of guys that spend money todo a bottom are 17 years old and also doesn't understand ring gap, oil clearances, or compression ratios. You start talking about checking line boar with a dial boar gauge and they look at you as if your speaking Spanish...


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[OBEEWON]

Some really good info in here:

http://zilvia.net/f/showthread.php?t=124925

[Kingtal0n]

Originally Posted by Tom N

I don't disagree with that. Who doesn't do that?

This guy:

Originally Posted by running_sideways

bottom end done. ... a new gt2871r .64

and a small host of others, which is why I brought it up.

[Kingtal0n]

Originally Posted by Jorgs_7

Probably would agree based on the SR history.

What about heat soaked track days and serious abuse? I don't blame you for putting better pistons in.

Evaluate this statement:

"All reliable daily drivers are not track cars, but all track cars are reliable daily drivers"

[mewantkouki]

Originally Posted by Kingtal0n

top mount, blanket, methanol

Fool proof 500whp

Originally Posted by running_sideways

Dropped a valve put a hole in number 3 cylinder. If I'm pulling it apart I'm going to up grade some shit. It's not like I tore the hole thing apart just for the hell of it.

Originally Posted by running_sideways

And 5k for a bottom end...haven't spent that much on everything I've got with new piston, rods, bearings, oil pump, timing chain, all the machining I have done. A lot of guys that spend money todo a bottom are 17 years old and also doesn't understand ring gap, oil clearances, or compression ratios. You start talking about checking line boar with a dial boar gauge and they look at you as if your speaking Spanish...

I see why they were confused.

[running_sideways]

Originally Posted by mewantkouki

Fool proof 500whp





I see why they were confused.

lmfao! reasons why i am know a English major! i will never be able to wright a novel...son of a bitch...

[running_sideways]

*NOT!

[OBEEWON]

Originally Posted by running_sideways

lmfao! reasons why i am know a English major! i will never be able to wright a novel...son of a bitch...

I love the syntax of this sentence lol. +2

[codyace]

Originally Posted by OBEEWON

I love the syntax of this sentence lol. +2

as we say

"yikes"

[codyace]

Originally Posted by running_sideways

finally got my sr20det bottom end done. thank god! but I've got a few questions about the top end set up. im going to drop some dough on a good snappy response going to get a new gt2871r .64 and i was looking at cams EVERYONE and they'er brothers always talks up jwt cams. really looking on getting the s4 but is this really the best results for gt2871r or should i maybe look at tomei hks. just looking for the best bang for my buck and dont wanna waste money on something that wont give me the best results. i wanna use this engine for scca and some close circut races. thanks for your opinions and if anyone has this kinda cam and turbo combo meal with fries hows your results???

Truthfully, the information has been in the 2871 users thread for almost/over a decade

With that said, the S3 IMO is a better 'street' based cam, the S4 being better suited to track rats, which spend their life 4500 rpm+

I'll forever and have forever supported teh JWT S3 cam. It's hand's down the best 'all around' street based cam you can get. Capable of big power regardless of the turbo, and yet aimed at the 3000-6000 range for best response. I'd say if you're only ever driving to Wawa, car shows, and well, 'Mexico' that S3's will serve you well. If you're driving at Watkins Glen, Palmer, NJMP, etc, then JWT S4's are your ticket.

With that said, S3's will still kick ass on track (at the expense of some top end compard to the S4), and S4's will still kick ass on the street (albiet slightly softer down low where the S3's work)