IT prep Whp for honda VTEC's

[jimmyc]

Jeremy, I think the HP calculation is where we need to look. Tell me where I can spend to make a 155 hp 1,6 VTEC motor a 175 hp motor? I can't make it rev 15% higher unless I cheat on the valve springs and port the head like a type r. Besides, the consensus is that the 1.6 intake won't flow sp unless I change the intake to type R, it won't make much difference.

Ok the head casting between the B16a and the b18c5 is the EXACT same, the b18c5 head was NEVER ported, hence why it was let in IT.

Torque (ignition timing, displacement, and compression ratio) are already good, and the engine is limited by valve float at over 8000. So, no surprise it realy can't be improved upon when its already 100 hp per liter. What do you expect; 125 hp per liter?? That would be a world challenge motor. Forget it.

(ps our 1.8 liter Integra Type R is 184 whp or essentially 100 whp/per literin IT trim and 109 street hp/liter per stock oem rating).


The last point is, cheating. At 100 hp/per liter, something like a type r has nothing to work with (it always has a race cam, and it is already reving to 8400 rpm); do I need to use nitrous?. Besides, if cheating is my goal,

This is two times you mention valves floating. And in the second quote you mention your B16a floats them at 8,000rpm.

I have never really heard this before, as 8,000 is the OE red line.

After reading what you ITR makes, there is something going on, either the engine build isn't up to snuff, the dyno tuning needs work, or the dyno just reads low. I'd guess it isn't number 3 though.

We have several 100% stock from honda internally, with intake, DC header, Hondata and exhaust that are making 185whp.

Have you thought about looking to other engine builders? Or even other tuners?

[mossaidis]

It's 'common' Honda knowledge that honda valve springs can handle OEM redline + 400... well, at least on the d-series they do. Mickey

[downingracing]

It's 'common' Honda knowledge that honda valve springs can handle OEM redline + 400... well, at least on the d-series they do. Mickey

Or WAY more - I ran my stock Z6 with a chipped ecu and took it to 9200 once a lap @ Mid-Ohio. Had that motor built and the valve springs were all in great shape within tolerance...

[mossaidis]

SNAP! Nice. I run my z6 to 7800, which is 600 over OEM. I used to receive signficiant HP loss after 7200 probably because of lack of efficient airflow after 7200 (D-series have small ports). With port matching and jackson racing IM gasket, it pulls nicely up until 7800 now.

[lateapex911]

This thread is shaping up to be a classic...
.....very informative.

[Ron Earp]

Move along, nothing to see here.

[bamfp]

This really makes me scratch my head.

ITS GSR race weight 2590lbs

178 whp

129 ft/tq to the wheels

Gear Ratio
1st 3.23
2nd 1.9
3rd 1.36
4th 1.034
5th .787

ITA Integra LS/RS/GS race weight 2620 (for the DC) and 2595 (DA)
(for both the DA and DC, i have never seen a difference in the two)
149 whp

135 ft/tq to the wheels

gear ratio (DC/DA same)
1st 3.23
2nd 1.9
3rd 1.269
4th .966
5th .714


Now how does a car that weighs less then either similiar(da)/exact(DC) chassis minus the motor/trans, but has more HP similiar TQ, and better gearing feel like an ITC car?

Ever driven an ITC car? They do not accelerate up hills very well.

[jimmyc]

Ever driven an ITC car? They do not accelerate up hills very well.

Something very close to it, but no never a a real ITC car.


I just think it's weird that an ITA car with alittle more weight, and less power can accelerate up the hill but a GSR can't.

[Xian]

Something very close to it, but no never a a real ITC car.


I just think it's weird that an ITA car with alittle more weight, and less power can accelerate up the hill but a GSR can't.

ITA cars don't really accelerate up T1 either... more of a "trying not to lose RPM/speed" kind of a deal. I suspect the lack of torque in the GSR and gearing are what kill it there...

[lateapex911]

I thought it was an "impression"...because looking at the numbers the car is lighter than the equivalent ITA car, as more power, and a better gearbox...certainly it's better then an ITC car... but relative to it's 'feel' at other places, it seems to lack in that one spot. That's my take on his statement.

[mossaidis]

This thread is shaping up to be a classic...
.....very informative.

I think the thread died a long time ago.