turbo and spool time

[jdmawd]

Since this topic is so popular. Lets start a what turbo do you have,what rpm do you reach full boost and in what gear.

ill start

Gear 3-5

rpm 3400

boost level 25 psi

Turbo FP3052

**edit**

Stock 7.8:1 motor and equal length tube exhaust header.

 

[anomalyinva]

You should also say what compression, displacement, and exhaust manifold you have at the least.

 

[kpt4321]

You get full boost at 3400 rpm with a 3052!? Oh god, I might have just changed my plans.


Gear - 3

Rpm - 3200

Turbo - 14b

 

[4g63awdtalon]

3rd gear

3000

8:5.1 comp

14b

2g exhaust mani

 

[IPT]

Well here were what the boost response was like on some of the turbos I have had:

These are stock 1G motor, 2G Exhaust Manifold & 3-5 gears:

14B
3100 rpms
18 psi

Garrett Big 16g hybrid
3500 rpms
20 psi

Original Mutt 50 w/clipped TDO5H turbine wheel
3500 rpms
22 psi

Now with a built motor (9:1 compression, P&P head w/sst valves & web cam street grinds), 2G exhaust manifold, gears 3-5

T25
2700 rpms
17 psi (would fall down to 10 psi at 4000 rpms)

Mutt Garrett center section 50 trim w/T3 high flow turbine wheel
3400
30 psi (race gas)

60lb/min compressor wheel, stage 5 turbine wheel, TO4B compressor housing, Bullseye Power turbine housing.
3800 rpms
18 psi

 

[90AWDTalon]

Gears 3-5

RPM 2600

20psi

Small 16G


MODS:
emanage, K & N filter, MAFT, ported small 16G@20psi, ported EVO exhaust manifold, Walbro 255, B&M CommandFLo@50psi, 680cc injectors, 2.5/3" downpipe, 3" cat, 3" cat back exhaust, 2.5" upper intercoller pipe, Supra side mount intercooler, Custom lower intercooler pipe, iridium IW24 spark plugs

 

[sidoze]

slowboy racing g54

3rd-5th

3,900rpms

20psi

150psi across all 4 cylinders (suposed to be 8.5:1 but whatever)

 

[DSMJim]

T3/T4 50Trim

3-5th

3700rpm

22psi

160psi across the board. Stock 8.5 compression

Stock Cams


Remember when looking at jdmawd's setup he's running HKS cams which dramatically decrease your spool up time!

 

[NOSLO2PT0]

FP Green

25psi

3rd gear

3900rpms

7.8:1 c/r

HKS 272's

 

[jdmawd]

Originally posted by DSMJim
T3/T4 50Trim


Remember when looking at jdmawd's setup he's running HKS cams which dramatically decrease your spool up time!

bastard

My spools time >*

 

[ShapeGSX]

Gears 3 through 5 should not have the boost threshold at the same point. 3rd gear will have a boost threshold RPM that is higher than that of 5th gear.

And you have to floor the car at a sufficiently low RPM (say 2000RPM) to test this.

 

[kpt4321]

Originally posted by DSMJim
Remember when looking at jdmawd's setup he's running HKS cams which dramatically decrease your spool up time!

I'd be interested to hear why you think this is true.

 

[jdmawd]

Originally posted by kpt4321
I'd be interested to hear why you think this is true.

If I had to guess. I would assume that with a large turbo that is moving large amounts of air. High lift cams allow a larger amount of air to be injested/expelled during the combustion process. More air in, more exhaust out. Which should hit the turbine wheel with greater speed and force to aid spool up.

 

[herostar]

3rd gear

2700 rpm

19 psi

FP ported BIG28

stock everything that's very important

 

[DSMJim]

Originally posted by kpt4321
I'd be interested to hear why you think this is true.

I'm interested in hearing why you think this is not true to be honest. It has been my understanding for a long time and what I have found in my own personal cars that a high lift short duration cam on a turbo car like an HKS on a DSM gives a faster spool over a more timid cam like whats stock in our cars.

My GTI Turbo that I did was a 4cyl 2 valve per cyl motor (86 GTi with a Corrado G60 motor switched to turbo from supercharged). My T3 spooled at 3200rpm when I switched over to a re-grind with more lift it decreased my spool time by about 400rpm which I noticed right away. This is different from a DSM however I would assume the premise of what is happening would be the same.

Please explain....

Here are two pictures just so we can something fun to look at, no other reason.

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[jdmawd]

{Bones from startrek voice}

Damn it JIM!!!!


Now you have done it..... next we will be hearing how ball bearing turbos don't spool faster either its just a figment of my imagination. surely Internet opinion supersedes My actual results

 

[turbo90gsx]

gear 3

rpm: 2750

boost: 14psi

comp: stock

damn you bastards with biger turbos!!

 

[kpt4321]

Whoa guys, seriously. I was just curious.

I agree with you in the case of a big turbo, I've seen the same thing. I didn't really know why it was the case though, so I was wondering if you did. I'm still looking for the technical reason.

Also, in the case of small turbos (14b/16g) I don't think it applies.

 

[Skeletor]

Ill post 2

Current car:

BR500
Stock 6 bolt longblock
4th gear
12-13psi by 3000 RPM's, 20psi by 3300RPM

Old car:
FP Red 7cm, clipped Td06H
9:1(only read 170psi)
272's
4th gear
25+psi by 4000-4100RPM's

 

[Z1500]

Originally posted by jdmawd
surely Internet opinion supersedes My actual results

That's a damn good line. I run into that with customers all day long.

Kevin
www.agpturbo.com

 

[bigjangin]

stock 95 7 bolt
small 16g
20psi at 3200 in third
20psi by 3000 in fifth

 

[DSMJim]

Originally posted by jdmawd
{Bones from startrek voice}

Damn it JIM!!!!


Now you have done it..... next we will be hearing how ball bearing turbos don't spool faster either its just a figment of my imagination. surely Internet opinion supersedes My actual results

Well beam me up scotty..

Acctually I was just looking for a reason to post those pictures of my old VDub here hahahaha..

 

[sidoze]

Originally posted by ShapeGSX
Gears 3 through 5 should not have the boost threshold at the same point. 3rd gear will have a boost threshold RPM that is higher than that of 5th gear.

And you have to floor the car at a sufficiently low RPM (say 2000RPM) to test this.

Nah its fine dude. Trust me my 50 trim is pretty damn consisent about being a lagginator. And Im sure JDM and DSMJIM and all of them would have specified too. There sticklers about specifics.

Your 16g on the other hand though....

 

[Phil Sochor]

GEAR - 3rd

RPM - 2700

BOOST - 17PSI

INTAKE - DSMParts hard intake pipe, K&N Filter, hacked 1G MAF

TURBO - STOCK 14b

MOTOR - Stock

HEAD - Stock

EXHAUST - DNP tubular equal length header, VRS turbo back 3inch with o2 housing eliminator, ported/polished 7cm turbine housing with 34mm waste gate flap.

 

[weepul]

okok, now I KNOW something's wrong....stock compression..

FP big16g

4500 rpm 2nd and above

20 psi

what the hell's wrong?? I understand the bigger the turbo the slower the spool time, but shouldn't I be spooling faster? I have upper and lower 2.25" IC hardpipe, 1g TB, ported o2 housing and exhaust manifold gasket, 3" DP, hi-flow cat, 2.5" cat-back. My vacuum lines are as short and direct as possible. The ONLY thing that isn't done is I have an Apex 3" intake with a custom intake...but that shouldn't effect me that much. What's wrong?