[chameleon]

Recently did this build for a customer, and definitely consider this one special because i dont usually do mild builds, but everyone has baby steps and some customers start from driving 160whp cars for a few years and go balls to the wall. This one definitely surprised the hell out of me just because its one of those setups that just worked very well.. or too well..

Specs:
K24 Shortblock - Bored Honed to 87.5mm
Wiseco 87.5 12.5:1 comp pistons
Manley H-Beam Rods
ACL Bearings
Type-s Oil Pump
PRB Type S Head
PRB Type S Cams (non Z1/3)
Ferrea 6000 valves
Supertech Springs/Retainers
Fresh Mill/Angle valve job
RBC Maniold w/ PRB TB
PLM 4-2-1 Race Header
Skunk2 3" Mega RR exhaust
chameleon tuning tentioner
chameleon tuning 520cc oem injectors
chameleon tuning custom shorty 3" intake
tuned on E85 from the pump. (E70)
Base 5spd w/ Comp stage 4

I have done over 50+ kseries on this dyno and plenty of cars struggle to crack 300 on here with high compression and BIG Cams.. I expected this setup to make 265 TOPS!! so i was very shocked to see this! Pulls were done in 3rd Gear on a Base RSX Tranny, which is pretty much geared to be 4th.

 

[pep]

Very nice!!

 

[Aronski_K24]

WOW 0_0 Thumbs up !

 

[Kick to ze liver]

Wow, that's an awesome surprise. Thinking 265 and coming away with nearly 290whp.....wonder if 300whp could be seen by porting the RBC and upgrading the throttle body?

 

[KdEJ1]

Holy crap.. very nice

 

[bac]

that torque seems to be waay over 200 as well, and for stock cams it seemed to have carried the power right till the end. Very nice!

 

[b.r.i.a.n.]

what was the duty cycle? stock fuel pressure?

 

[drtye]

Damn. Freak motor. Congrats to the customer. :up:

 

[chameleon]

what was the duty cycle? stock fuel pressure?

Remember seeing 75-80% up top, walbro 255 in tank, factory fuel pressure.

 

[brakaT]

Stock port head?

I always thought stock cams and high compression was risky because of lack of cam overlap or am I totally wrong? :thud:

 

[Nyborg Garage]

Almost 240 torque to the wheels?

100NM/liter to the wheels is very good (on stock cars 100nm/liter on the flywheel is the norm). This is 135nm/liter. Seems highly unlikely, even on E85 racefuel.

At peak HP the torque is about 200 ft lbs. This is doable, but not that high in the rpms with stock cams and TB.That's what I think anyway.

I like that you do a leak test on during assembly. very nice numbers!

 

[chameleon]

Stock port head?

I always thought stock cams and high compression was risky because of lack of cam overlap or am I totally wrong? :thud:

on the contrary, bigger cams bleed off compression where i dont think stock cams barely do so you get the full benefit of the compression.
btw yes stock port head.

Almost 240 torque to the wheels?

100NM/liter to the wheels is very good (on stock cars 100nm/liter on the flywheel is the norm). This is 135nm/liter. Seems highly unlikely, even on E85 racefuel.

At peak HP the torque is about 200 ft lbs. This is doable, but not that high in the rpms with stock cams and TB.That's what I think anyway.

I like that you do a leak test on during assembly. very nice numbers!

i would say 230ish peak tq, limiter is 8600 and vtec is at 3600.

 

[nuk1ear]

holy crap and thats 289 on a dyno dynamics! would read even more on a jet

 

[VegasK20ek]

wow! now that makes me hopeful, I'm in a middle of a very similar build. great numbers!

 

[double11]

Nice build.

I'm hoping to put together something similar this summer.

Curious why you used E85? We have 93 Oct at the pumps down here. Personally I'd rather run the 93

 

[Ralph]

Digital tq. and angle on that snap on :shades:

 

[AWH]

on the contrary, bigger cams bleed off compression where i dont think stock cams barely do so you get the full benefit of the compression.

This here.

The "risk" part is that the higher dynamic compression can more easily cause knock. Thus the need for E85.

One of my earlier motors was a bone-stock K24A2 but with 12.5 pistons. Had to back off ignition timing a bit to keep it from knocking on pump 93. Ran great on E85...and made more power with timing set back up.

 

[chameleon]

This here.

The "risk" part is that the higher dynamic compression can more easily cause knock. Thus the need for E85.

One of my earlier motors was a bone-stock K24A2 but with 12.5 pistons. Had to back off ignition timing a bit to keep it from knocking on pump 93. Ran great on E85...and made more power with timing set back up.

Yes, loaded up a map from. 11:1 compression tunr and she knocked like whoa, customer had no prpblem using e85 so even better to get full potential out of this setup.

I have done a few big cam 12.5 builds and end up around 290whp.. same dyno. Both 93oct.. so very surprising what this put out..

 

[double11]

One thing I haven't seen anyone mention is stoichiometric air fuel with e85 is about 9:1. Thus requiring about 30% more fuel than 93 Oct for the same lambda value.

I hope everyone tuning with these fuels understand that, and your not leaving these tunes in a lean state by just switching fuels.

 

[AWH]

One thing I haven't seen anyone mention is stoichiometric air fuel with e85 is about 9:1. Thus requiring about 30% more fuel than 93 Oct for the same lambda value.

I hope everyone tuning with these fuels understand that, and your not leaving these tunes in a lean state by just switching fuels.

It won't even run if you leave it 30% under-fueled, so it is pretty obvious.

And if using KPro, you don't even have to think about it. KPro does its internal math in lamba, since that is what the O2 sensor reads...and lamda is independent of the AFR. It then translates to "gas" AFR's when it displays it. So you tune for 13:1 (or whatever) *indicated*, which ends up being way less actual E85 AFR.