D16z6 - T28 Turbo - Pump Gas Dyno Tune

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This setup belongs to Chris (screen name jdmcivic-sc) from Rock Hill. He brought us the car for a dyno tune, but there were boost leak issues, along with a leaky head gasket before it went on the dyno. We installed a new head gasket, along with a set of ARP head studs, repaired the boost leaks, and got him back on the rollers to finish up the tune.



Here is the setup:

D16z6
Mild port and polished head
ARP Head Studs
Performer X Intake Manifold

RC 750cc Injectors
Walbro 255 LPH
Adjustable FPR
OmniPower 4 Bar MAP Sensor
MSD Coil
MSD Distributor Cap

Cast manifold
T28 Turbo w/ Internal wastegate
eBay FMIC
Greddy Type S BOV
2 1/2" Downpipe

Tuned on Crome Gold

Here are the results:

Boost pressure was fluctuating between 6.5 and 7.1 PSI. This is due to the internal wastegate.

[Spent]

For the record, 7.1psi was according to the datalogs. It was 9'ish psi on the boost gauge and the internal wastegate is 11psi.

As a tuner, my mind has trouble gasping how it was able to produce this much power while reading such a low boost. On a ported head like this one, I would expect 275whp out of 13-16psi with a good tune. Next time, I'm checking the map voltage at atmosphere and comparing against manufacturer specs since 4 bars and higher capacity map sensors have been known to be off. In the case of the 4 bar by 2psi on average. Regardless nothing can be taken away from the power it made on a stock motor (minus head studs and gasket) and how smooth the chart is. Future plans include rods and pistons, then it will be reliable and be able to handle more power.

[dave99rt]

(01-18-2011 09:23 PM)Spent Wrote:  For the record, 7.1psi was according to the datalogs. It was 9'ish psi on the boost gauge and the internal wastegate is 11psi.

As a tuner, my mind has trouble gasping how it was able to produce this much power while reading such a low boost. On a ported head like this one, I would expect 275whp out of 13-16psi with a good tune. Next time, I'm checking the map voltage at atmosphere and comparing against manufacturer specs since 4 bars and higher capacity map sensors have been known to be off. In the case of the 4 bar by 2psi on average. Regardless nothing can be taken away from the power it made on a stock motor (minus head studs and gasket) and how smooth the chart is. Future plans include rods and pistons, then it will be reliable and be able to handle more power.

yeah, what you said!
especially 212 ft-lbs at 7 psi from a motor that makes under 100 when n/a.

[Spent]

Also, the head has been decked twice according to the machine shop. Stock compression is 9.2:1.