76 replies to this topic

[vocky]

306.2 bhp @ 7000rpm
253.7 ftlbs @ 4500rpm

well done, I think you deserved that after all the hassle you had

[leevx2.2]

306.2 bhp @ 7000rpm
253.7 ftlbs @ 4500rpm

just needs leaning out between 2.5k and 3.5k and thats the mapping completed.

fcuk me that's a great result

[VXT Tim]

I think I won, I want my slug!

[Speedy4Fun]

Is this with standard fuel pump? Can't find it in your mods list. Can't you borrow a 3" tullet and do that dyno again. Would be very interesting to know were(if?) you would gain extra power.

[M3 BFG]

Nice to meet you briefly Chris and it seems the drive down was well worth it Hope that Courtenay mechanic sorts himself two new wheels and suspension. That was a nasty smash we all witnessed Simon

[Tail slide]

1. Great result, can't wait for them to finish building mine, and glad I didn't go turbo route (sorry tubbies!) 2. Told you so 3. That's a 3-way tie for your slug, but I'll be noble and let the others enjoy half each.

Edited by Tail slide, 11 April 2011 - 09:06 PM.

[chris_uk]

yea nice to meet you simon, sorry i was away with the faries when you was going i was trying to get signal on the phone. lol yea, at last the suspension is pretty cheap to repair Im shattered now, just got in. pretty happy with the results, feels very nice to drive and quite smooth through the gears.

[chris_uk]

[EASTYORKSVX]

amazing results chris wish i could get near that on thursday but only going for a stage 2 sc map unfortunatley enjoy pal

[chris_uk]

cheers, its a long trip down there from up here.. but worth it i suppose

[southpaw]

One fine result Chris and on a 2.5" system

[Exmantaa]

Nice curve!! Pretty much maxed out the M62 blower potential with this result. I suppose you have an uprated pump fitted to achieve sufficient fuelling??

[chris_uk]

yea, its the uprated one like cliffe sells, well its identical i just got it from courtenays. pita to fit aswell lol the curve starts to drop off at about 7000 but with a 3" exhaust the line should just carry on up to 7200rpm (rev limit) so maybe an extra 5bhp for the 3" system then the s/c needs changing to get anymore.

[Exmantaa]

Why the 7200 limit if you have springs and cam fitted?? Power drops of, but is nice if you don't smack into the rev limiter all the time... You can work a bit on air inlet and blower, but probably the intake manifold is getting restrictive too at the higher rpm's. (Switch to E85 or meth injection for more power. Or fit the Harrop. )

[Winstar]

yea, its the uprated one like cliffe sells, well its identical i just got it from courtenays. pita to fit aswell lol

the curve starts to drop off at about 7000 but with a 3" exhaust the line should just carry on up to 7200rpm (rev limit) so maybe an extra 5bhp for the 3" system then the s/c needs changing to get anymore.

I'm not so sure the thing with the VX exhaust is the main loss is the bends, if going to a 3" means you need to change to tighter bends (1D instead of 1.5D) then you could end up with an exhaust that has just as much pressure drop.

I've said it before but the main probelm is the inlet manifold as if you look a the test data in this artical clicky, in particular the last two plots that show pre and post CC pressure, you can see that it massivly diverges to the point were the SC si still increasing pressure pre CC but it isn't being seen post CC. And that is with a 2L engine so 10% lower volume flow rate.

[chris_uk]

since i have no intention in upping the power anymore and the peak power is at 7000 so there is no need to have it any higher.

[Exmantaa]

I'm not so sure the thing with the VX exhaust is the main loss is the bends, if going to a 3" means you need to change to tighter bends (1D instead of 1.5D) then you could end up with an exhaust that has just as much pressure drop.

I've said it before but the main probelm is the inlet manifold as if you look a the test data in this artical clicky, in particular the last two plots that show pre and post CC pressure, you can see that it massivly diverges to the point were the SC si still increasing pressure pre CC but it isn't being seen post CC. And that is with a 2L engine so 10% lower volume flow rate.

Was my idea too; use a 2,5" muffler with bigger (2.75-3"), larger radiused bends. (Maybe change to a side exit and loose 2 90* bends)

To those test data curves: not sure on the influence of temperature on the divergion. Post Laminova air is cooled so the pressure decreases... But interesting to see that with almost similar boost pressures at the motor (~21psi@7000), that TVS has a higher power and I can only explain that due to lower charge temps.
On the other hand a TVS is more efficient than the MP90, so if charge heat was a major factor here, those MP90 pressure lines should diverge a lot more than the TVS. And its both ~2psi@7000 so...

Back to Chris.

Edited by Exmantaa, 13 April 2011 - 05:08 PM.