Help me read this compressor map!!

[Foxcolt]

http://cherrypicker.tripod.com/sitebuildercontent/sitebuilderpictures/to4e-46.jpg

36LB/Min or 520cfm @ 2PR @ 68%.
39LB/Min or 564cfm @ 2PR @ 60%.
42LB/Min or 602cfm max flow @ 60% @ 19psi.
30.8psi max boost limited by compressor wheel speed.



based on this map can someone tell me when should one expect spool start and full spool.

Thanks!
Jed

[uiuc240]

image no workie. is this what it looked like?

http://www.turboneticsinc.com/comp_maps/Fig12.gif

It's a t04e, so I would imagine a pretty late spool, with full boost well into the 4k mark with an SR. The biggest factors in that is going to be getting the motor to breathe better (cams and big exhaust). Are you thinking of selling the GT2540 and getting this or something? Or are you just trying to compare the chart to your turbo?

Eric

[Foxcolt]

lol...how did I know you would respond to this thread:D
I shoulda just PM'd this to ya.

Well, the website I pulled that off of stated that it was a compressor map for the 2540, I thought it seemed a little fishy, but you just reafirmed my thoughts.

However as of right now I don't spool till 4 grand:eek: But I think that's due to other problems not the turbo.

here's the link to the page
http://cherrypicker.tripod.com/turboupgradeforvg30dett/id6.html

[uiuc240]

haha...yeah...i knew that would be the response. ;)

actually, if you read about turbos, it seems about right that your 2540 will spool faily late. that's the problem with heavily mismatched wheels. but you're right, you might also have other issues going on there (exhaust leak, right?). that could cause some weird turbulence in the exhaust system, possibly screwing up the way things boost. I've had a leak down by the cat forever. can't wait to be done with school so i can get to work on the car. i'm so tired of having it run like a piece of ****. it's so close to running really nice. :mad:

anyway, good luck with the turbo. even if it spools late, it sounds FAST, so that's cool. i'm putting that T28 in this summer (I hope) and from what you're saying, i think i'll just rock the adjustable HKS actuator. did you get that from jspec? anyway, when do we get some pics of your car, biatch?! it's been a long time.

Eric

[DuffMan]

A compressor map alone won't tell you how fast a turbo will spool because that's dependant on both the turbine and the compressor side.

A compressor map will tell you what efficiency the turbo will be at for a given power level and boost level, and whether the turbo can support that flow at that boost and will help you determine the likliness of surging occurring.

[Foxcolt]

No pics, why? because people steal my ideas!!!:eek: :D :eek:

That and I don't have a digi cam. But I'll try and post em soon.

if the turbo is supposed to spool as late is it does right now then I'm toss'n that POS straight out the door!

Seriously, that just can't be right. I've read/heard of some people saying that it'll produce usable boost by around 3 grand, I'd be ok with that. As of right now I drive off boost unless I floor the damn pedal. Not fun, especially for a daily driver.

The acuator I got came with the turbo. Email Jspec and see if they have any in stock. If not I'm sure most of the stores that we usually shop at can get em, heavy throttle, project silvia etc etc..

PS: On a different note, I tried using the Pwr steering outlet flange from my old kaslow pump. Turned out that the flange would fit however the pipe comes straight out at 90 degrees. So no workie workie since it hits the exhaust housing. I was thinking of cutting it and trying to fit a peice of hose in there. Will update later.

[Foxcolt]

Originally posted by DuffMan
A compressor map alone won't tell you how fast a turbo will spool because that's dependant on both the turbine and the compressor side.

A compressor map will tell you what efficiency the turbo will be at for a given power level and boost level, and whether the turbo can support that flow at that boost and will help you determine the likliness of surging occurring.

I knew that;) I was just test'n ya:D

[uiuc240]

good call, Duff. you're absolutely right. that's a better way of saying what i was trying to put in to words (not very verbose this morning, apparently ;)).

do you still have a cat on your car, Jed? and are you sure all your vacuum hoses are on tight? check for leaks in the plumbing? do all that and make sure everything is AOK before tossing the turbo.

as for the PS elbow, you're *supposed* to cut it slightly. then just pop a hose on there, clamp it down and go. :D

Eric

[nrcooled]

If you are still spooling super late in the power band instead of tossing the turbo try upgrading your cams. Greaser had good succsess (from what I read on FA) with the stage 1 HKS cams ($200 ea. from Enjuku).
http://www.enjukuracing.com/images/srCamshaft.jpg

So instead of changing the turbo, change your powerband. That will shift you more towards topend so even if it does hit late when it hits it will be comparable to a ton a bricks ;) .

Or if all else fails go with a 50shot :D hahahaha j/k ::with no fuel as is, that would be bad::

[Foxcolt]

no cat, I fixed one leak the day I got done with the turbo. Made spool a lot better, I'm about 80 sure I have more. With rain/school/work I'm not gonna be able to work in that bastard till thursday at the earliest. Stupid life.

After looking at the pwr steering flange at looks like you wouldn't be able to cut it enough to clear the housings.
However! I could cut it right at the bend and clamp the living beezesus out of it. that should work well.

[Foxcolt]

Originally posted by nrcooled
If you are still spooling super late in the power band instead of tossing the turbo try upgrading your cams. Greaser had good succsess (from what I read on FA) with the stage 1 HKS cams ($200 ea. from Enjuku).
http://www.enjukuracing.com/images/srCamshaft.jpg

So instead of changing the turbo, change your powerband. That will shift you more towards topend so even if it does hit late when it hits it will be comparable to a ton a bricks ;) .

Or if all else fails go with a 50shot :D hahahaha j/k ::with no fuel as is, that would be bad::

Cams are going on my special super extra head project:D

[uiuc240]

hmmmm....that kinda sucks about the clamping situation. it would BLOW to have that slip off while driving. if you do cut it close, get a tool at the auto parts store to put a lip/dimple/roll (can't think of the word...fock) on the end of the tube.

Eric

[Tubed4evr]

Flare