I am kind of thinking outloud here but would it not be better if all tuners had a dyno jet dyno so that the numbers would be uniform across the whole country ?

To me its silly - honestly - when people try and compare numbers from one dyno to another - even trying to compare results from different cars

Here in this thread is a classic example of the BEST USE for a dyno

You use the same settings - same dyno - same car - change ONE part - tune with the same boost and a/f and then you can see the difference that results from making one change - in this case changing just the turbo

The whole point of the excercie was to see what the effcect on spool up - TQ and the shape of the power band would be by changing the turbo

To me its idiotic to whine about how much peak power it made as that was not the objective of the test - the test's purspose was to compare two turbos on a level playing field

AL

 

I figured the car would be a little laggy. It's not even noticeable with the 4g63 2.3 stroker.
Other mods are BC 280's, ported head, bc springs and retailers. aps 3", turbo xs intercooler.

It is a great feeling coming out of third gear, and landing in the sweet spot beginning of the power-band. 426 is disappointing on pump gas? pfft. I am happy as hell , I'll let you guys know what I track it...

 

How can you say that though when the graph clearly shows the 50 trim at 18-19psi and the GT37 at 22-23psi?

 

BTW all did a kick as job at making the tune streetable with this large a turbo and vta bov. Jimmy ( the shop ) kept me in the loop, and saved me plenty of long trips by opening up a shop here in CT that does work, and more importantly does it WELL.

 

Correction

The 50 Trim spiked to near 25 psi - (acutally 24 and change) and then the boost tapered down to a lower level during the pull

IF you closely examine the dyno chart it logs the boost and you can see the peak boost on the 650 trim was higher at 24 and change and the GT37 was between 22 - 23 at all times during the run

I can not say whether this was a turbo defect or just a POS turbo - I did not examine the turbo for all I know it was a ebay imitation turbo

The point of the thread was to compare the 50 trim that came with this customer's R N R turbo kit to a Gt37 - that is it

(BTW - IMHO - this car was fast - it is on boost all the time and 430 whp is plenty for my taste on straight pump gas)

AL

 

Who cares about what the boost spike was.

The 50 trim was as about 18 psi and the GT37 was at about 23 psi. Again, no comparison of the two turbos.

Maybe the turbo was a POS as you say, but this is not a good comparison of a 50 trim and a GT37.


Eric

 

Let me get this straight, a 50 trim (~50lbs/min) can't make the same power as GT37 (~60lbs/min) at roughly the same boost and the larger turbo is laggier but holds boost better. Nothing too earth shattering there; sounds like he had a bootleg Ebay turbo and by replacing the turbo was able to make decent power. I don't think the results are due to a weak pathetic RNR kit.

 

In my opinion it would make more sense to not fudge the Dyno Dynamics numbers. If I recall, Dyno Dynamics asserts that all their dynos should produce very repeatable results across different dynos, provided you listen to how they suggest setting them up.

By going in and fudging the numbers one way or the other... you add a next level of confusion to the mix. Now we are left saying... XXX whp on DD BUT on those rollers at "The Shop" who fudge the numbers higher to match DynoJet.

Yuk

Also, how is 430 whp (DynoJet'ish number) on pump gas ok with a 37R?

And how did you decide that 23 PSI was the appropriate boost to run on the fuel you used for the 37R? Did you try running more boost and found that power was down when doing so?

 

What most people on here doesnt understand is flowcharts of a turbo. Yes a 50trim may have had more boost but it dropped on its face like a stock turbo. Does that make sense? Not really, like Al said, it could be a defect turbo or just a POS turbo, while of course running a 37r with a much larger compressor/exhaust housing will hold much more boost to redline and maybe might be in its flow range at 22-23 psi where it starts to make more power... Most people on here just go with what a vendor says it will do because they say it, pay alittle more attention and do alittle more research before you can question someone who has just done a test and proven a fact...

Dan

 

This comparison makes absolutely no sense. The vehicle had an obvious boost leak as per what the graph represents.
If you were to compare the vehicle in good form it may have come out with a better comparison. This is just another thread about misinformation.

 

Often when cars come in used with high miles which have been put together by other shops we are working to find out why they dont run properly and to diagnose problems - this was a typical situation - a car that was not working well

The turbo on the car may have been defective or faulty but it had no boost leaks what so ever - we test nearly every car for them and this was one of the ones we tested

The only real way to get the the bottom of this would be to put this turbo on another car or send it how to be tested

Rather than dickering around with the tiny snail the customer just stepped up to a man sized turbo to match his 2.3L power plant

I thought the comparision was interesting

Also, I was kind of pleased with how well the car ran with a reflash and a large snail and large injectors, cams, built motor etc

The car was a pleasure to drive when I was done - it was a car which was neat

People should not get so upset and agitated by threads like this and just read them for what they are worth

Al

 

As much as these threads do stir arguments, I have to say thank you to Al for posting this type of info. Any tuner participating in these forums and sharing knowledge I give a big thumbs up!

 

It is really helpful to have real world data of how two turbos compare on the same car. I get were everyone is arguing over boost and such it would be nice it the RnR turbo was working correctly and not losing boost. Oh well comparisions side by side of this nature are rare.

 

Yikes on the whole 20k miles? what happens after that?

 

was this on race gas?