Tiguan IS38 and Big turbo upgrades

**Melbourne_Tiggy** · 08-03-2019, 09:02 PM

Originally Posted by INASNT

Snail 460 hybrid dyno numbers on MK7 GTI..

Attachment 42937

That is very impressive! Are you thinking about the hybrid route or looking for an RS3FL?

**tigger73** · 09-03-2019, 09:18 AM

Great numbers but I'm still a little concerned how late these come on. Seen this with a few tuners that they really only on full boost at 4,000rpm.

Tiguan IS38 and Big turbo upgrades-mk7-gti-is20-snail-460-jpg

**Dose Pipe Sutututu** · 09-03-2019, 02:49 PM

based on that torque curve, the boost is probably "all in" i.e. at the boost threshold by 3.5k~3.7k

Then again, is that real RPM or derived RPM on that dyno

**tigger73** · 09-03-2019, 03:10 PM

I've seen the same sorts of curves from other tuners using the same/similar turbo.

Who knows if it's "corrected" RPM based on roller RPMs.

**Melbourne_Tiggy** · 09-03-2019, 03:46 PM

That torque curve seems to drop off quickly after 4500 rpm....maybe the person should have gone a hybrid IS38 rather than hybrid IS20....

**Ozsko** · 09-03-2019, 05:53 PM

Originally Posted by tigger73

Great numbers but I'm still a little concerned how late these come on. Seen this with a few tuners that they really only on full boost at 4,000rpm.

It certainly would be a dog to tow with.

**tigger73** · 09-03-2019, 10:16 PM

Originally Posted by Ozsko

It certainly would be a dog to tow with.

And not that great as a daily either. That's my main concern with going larger turbo that you end up with a car that is hard to enjoy as a daily driver.

**h100vw** · 10-03-2019, 01:22 PM

Originally Posted by tigger73

I've seen the same sorts of curves from other tuners using the same/similar turbo.

Who knows if it's "corrected" RPM based on roller RPMs.

Same dyno as ours. It will be ratio. ie, you run the vehicle in the same gear as your intended power run. Drive up to 100kmh, then enter the revs at that speed. Variations in tyres obviously will cause some inaccuracies. Plus the rev counter isn't all that good compared to pulling the engine speed with vcds.
Honestly, that snail 460 is a ripper. I fitted the one in the GTI above. And we've done some in MK7Rs. Very responsive.Alex's 7R just received an interesting... - Underground Performance | Facebook that's a mk7r with a 460 done on UGPs dyno. Def in ratio.

**tigger73** · 10-03-2019, 02:27 PM

Originally Posted by h100vw

Same dyno as ours. It will be ratio. ie, you run the vehicle in the same gear as your intended power run. Drive up to 100kmh, then enter the revs at that speed. Variations in tyres obviously will cause some inaccuracies. Plus the rev counter isn't all that good compared to pulling the engine speed with vcds.

But should be accurate to within 50-100rpm I would guess??

Originally Posted by h100vw

Honestly, that snail 460 is a ripper. I fitted the one in the GTI above. And we've done some in MK7Rs. Very responsive.Alex's 7R just received an interesting... - Underground Performance | Facebook that's a mk7r with a 460 done on UGPs dyno. Def in ratio.

And this is where it gets tricky looking at dyno charts. 2 charts same car and the low rpm "response" looks quite different between the 2 runs:

Tiguan IS38 and Big turbo upgrades-ugp-stage-3-snail460-is20-jpg

vs.

Tiguan IS38 and Big turbo upgrades-ugp-stage-3-snail460-is20a-jpg

not sure whether this is just smoothing or if it does come on this strong at ~3,500rpm

**Psych101** · 10-03-2019, 03:22 PM

Originally Posted by tigger73

But should be accurate to within 50-100rpm I would guess??

And this is where it gets tricky looking at dyno charts. 2 charts same car and the low rpm "response" looks quite different between the 2 runs:

vs.

not sure whether this is just smoothing or if it does come on this strong at ~3,500rpm

Power is exactly the same on those graphs. The difference is the othe line. One is showing torque and the other is manifold pressure.