homemade wrx

that's what I would have thought except the "2.27 L" displacement same as the regular 2269cc (2.3) stroker setups...so I guess this is based on the sleeved block to get the extra disp....?

then again it does require a custom headgasket and would be priced for a sleeved block.

94mm stroke and 87.5 piston is 2.260...closest I can get it without doing completely custom crank and or .25mm increments on the bore.

AMS

iTrader: (3)

Ted is correct and I'll leave the exact #'s out for now. Obviously the rods are longer which moves the pin up and takes weight out of the piston. If stroke is shorted, then yes the bore is bigger to make up the displacement. The actual displacement is 2260cc's so it's little smaller than the std. 100mm stroker. Well ok, I'll give one exact number out

The rod ratio is actually higher than stock and the piston speeds come down because of two factors, stroke, and rod length. Using software, I've figured about a 160-180RPM gain just from the reduced G's because of the rod length.

Here, read this

https://www.evolutionm.net/features/article.php?id=77

There is some good info on the basics.

homemade wrx

very interesting...seems similar to a motor I've designed (haven't built) but only have a RR of 1.64 in a 4g63 block...also 2260cc's...now I'm quite curious.

I've done the same principles with my subie engine...almost an EJ257's displacement but with a much more favorable, high rpm rod ratio and better discharge coefficients..also more room for deshrouding the valves.
Based on matching absolute max acceleration (as spreadsheet refers to atdc as "-") I gain 300-330 rpm pending on how high redline is set.

I'm quite interested to see how the RR motor will do in customer hands!!

-Micah

value

iTrader: (1)

Keep talking dirty like that martin. Any graphs with it hooked up to a 37R yet ?

Migsubishi

iTrader: (38)

^^^^+1

broddey

iTrader: (5)

Any customers that have this kit want to chime in with opinions?

stefano

iTrader: (11)

+1

homemade wrx

I still find it funny that martin posted "no dimensions will be mentioned" directly under my formula to get a suspiciously close shortblock

Q8_EVO

iTrader: (67)

looks like an awesome setup

High_PSI

iTrader: (50)

Please someone buy this and run this.

with a 37R, is 700WHP possible?

Also, from what I have heard, the 40WHP gain isn't worth the additional lag the 37R has with it, truth?

Blue Evo 8

iTrader: (40)

Thats a good question, I'd like to know also

Ted B

iTrader: (6)

700whp is possible with a PT67R. Speaking from my personal experience, I wouldn't even consider using one unless it were a twinscroll setup.

The HTA 35R covers a bit of the difference between a 35R and PT67R, but with superior spool characteristics.

High_PSI

iTrader: (50)

Hmmm I would like to see AMS try out an HTA 35R on their kits, straight swap with the .63 housing. No swapping housings with it, same everything except the HTA turbo.

Sharkbite2000

iTrader: (21)

Me too I would love to see the graph of a 37R set-up.

AMS

iTrader: (3)

i guess i'm a little confused on the HTA turbo, the compressor cover we use has a 4" inlet with a 2.5" outlet also, and the newer style compressor covers have the surge-port inlet extend (smooth bellmouth) to the cover inlet. Not sure there is really any difference, and unless someone has tested the variation of 35r we use against the turbo buschur calls the HTA35R, then you really can't give any subjective opinion on it.

The 37r (67ptrim) is capable of 700-720whp, while the 35r is capable of 630-650whp, so you're looking at roughly 50-70whp gain.