spoke to tuners today, here's what they say

[Teddy92110]

jobby lol. Thats in the long run anyway....

[RattyMcClelland]

You can hit around 300bhp or around the 6-9 psi Mark on stock internals and you should be fine however for ultimate piece of mind then sleeving the block is the way forward.

But it's the torque you want to increase . Increasing power buy 20-40bhp won't make a massive difference to performance compared to increasing torque.


I'm on 290ish bhp and 225ish lbft at 6.3psi on my supercharger. Engines runs sweet but it's all in the tune.

I can run 9psi but I dare not yet as the rings may give in.

[Teddy92110]

Right so your running a supercharger. Is a supercharger more smooth when it comes to vtec kicking in cos ive seen some vids where vtec has kicked in and everything goes mental like losing traction and all that

[Merlin]

Good point Ratty, BHP isnt everything.

With the ATR H22a7 intake manifold (and associated mods) you can see torque increase from roughly 130lb/ft @ 3K rpm to 160ish lb/ft @ 3K rpm. This makes a huge difference to the drivability of the car, more oomph and more oomph low down.

Peak torque in my 4th gen is 180-190 lb/ft and that is NA (OEM engines make around 150-155 lb/ft peak).

[Teddy92110]

Wouldnt it be cheaper to get an atr engine off ebay and stick it in as ive seen a full engine package for £995 then a remap.

[chrismc]

Good point Ratty, BHP isnt everything.

With the ATR H22a7 intake manifold (and associated mods) you can see torque increase from roughly 130lb/ft @ 3K rpm to 160ish lb/ft @ 3K rpm. This makes a huge difference to the drivability of the car, more oomph and more oomph low down.

Peak torque in my 4th gen is 180-190 lb/ft and that is NA (OEM engines make around 150-155 lb/ft peak).

stock H22A7 ATRs I've seen (my own included) will only make 160lbs/ft peak! Pre- VTEC peak is maybe 135lbs/ft @ 5xxxrpm

130lbs/ft @ 3000rpm is pretty fanciful to my mind...

[wurlycorner]

What power were ddoubledanny and sir_si running on their turbo motors that didn't last? Didn't think either of them were wound up particularly high? (as in less than 300bhp)
Simons first 2 even had mahle pistons.

[RattyMcClelland]

I think overboost is the problem on turbos and that's what kills the H22 engine when it runs lean.

I think both were around 270bhp at the fly.

[Teddy92110]

How about on vtec will it not spin out or is there something you can do to sort that such as lower the vtec to where the turbo kicks in

[Merlin]

Good point Ratty, BHP isnt everything.

With the ATR H22a7 intake manifold (and associated mods) you can see torque increase from roughly 130lb/ft @ 3K rpm to 160ish lb/ft @ 3K rpm. This makes a huge difference to the drivability of the car, more oomph and more oomph low down.

Peak torque in my 4th gen is 180-190 lb/ft and that is NA (OEM engines make around 150-155 lb/ft peak).

stock H22A7 ATRs I've seen (my own included) will only make 160lbs/ft peak! Pre- VTEC peak is maybe 135lbs/ft @ 5xxxrpm

130lbs/ft @ 3000rpm is pretty fanciful to my mind...

Maybe it is because all the preludes with ATR intake manifolds's are tuned? I do concede that an ATR IM does not necessarily jump you up straight up to 160lbs/ft @3K rpm, I was quoting my own engine, but it wont be far away from that level when you have the supporting mods.



130lbs/ft @ 3000rpm is only 74 bhp. From my experience stock/relativity stock H22's seems to put out around 130lbs/ft @ 3000rpm. The difference in yours and my experience could be down to the fact that a stock Lude will have dual runner intake manifold and resonator, which is designed to increase low end torque, and the ATR doesnt?

My stock H22a8 (Type-S/H22a8 intake and OEM resonator) on a Maha - 130lbs/ft @ 3000rpm


and on a Dastek - 128lbs/ft @ 3000rpm


And the majority on the old PUK dyno thread where around 130lbs/ft @ 3000rpm http://preludeuk.forumup.com/viewtopic. ... =preludeuk