Low dyno numbers w/ 228R

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Jul 25, 2009 | 12:08 PM

apex_7

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Low dyno numbers w/ 228R

I just got my car running and I feel like the numbers are a little low. I put ~100 miles on it before the dyno.

It's a 98 LS1/T-56 w/ 00 heads out of a WS6 T/A and no egr
-ceramic coated 1&7/8" longtubes
-228R on 114lsa w/ PRC dual valve springs/retainers
-magnaflow dual 2.5"-to-3" y-muffler to 3" out (no cats)
-Spec 3+ aluminum clutch w/ aluminum fidanza flywheel
-3" intake w/ rubber and aluminum couplings and a 3" K&N cone filter
-TSP mail order tune
-ported/shimmed LS6 oil pump
-LS2 timing chain

The dyno pulls were made in 4th gear w/ no fan up front. Um... I guess I just expected more power after reading a few threads on these boards. It seems a little lean also (but it smells REALLY rich at idle).

Any suggestions???? Maybe the exhaust is too restrictive?

Jul 25, 2009 | 12:15 PM

Slowhawk

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From: Bridgewater,Ma

Well,by the graph it's obviously not tuned. That is your problem right there.

Needs to be tuned in a bad way.

Jul 25, 2009 | 12:18 PM

apex_7

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Could you elaborate?

Jul 25, 2009 | 12:22 PM

LARRY01Z28

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From: Eubank KY

I think its in the tune 14.8 AFR WOW!!!

Jul 25, 2009 | 12:25 PM

LARRY01Z28

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From: Eubank KY

i would get with TSP and tell them your numbers and your AFR. and then they can work on your tune and re send you a new one.

Jul 25, 2009 | 12:26 PM

apex_7

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word. Thanks Larry.

Jul 25, 2009 | 12:26 PM

corvet786c

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From: Port St. Lucie, Fl

it needs a tune man and AFR needs to be around 12.8-13.1

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Jul 25, 2009 | 03:29 PM

The Dragon

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From: Tampa, Florida

BOOM lean.

Jul 25, 2009 | 07:46 PM

#10

ScreaminRedZ

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Is this setup in an fbody?

Jul 26, 2009 | 10:08 AM

#11

apex_7

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Nah, it's in a rx7.

Jul 26, 2009 | 06:54 PM

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Slowhawk

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From: Bridgewater,Ma

Quote:

Originally Posted by apex_7

Could you elaborate?

It just needs a tune in a bad way.Probly the placement of the Mass air is the cause,but still needs to be tuned to get the most out of it.
Right now the tune is dangerous.

Jul 26, 2009 | 10:19 PM

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thunderstruck507

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From: Northwest AR

you say placement of the MAF, where should or should it not be?

Jul 27, 2009 | 03:04 AM

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Nitroused383

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From: Washington

The maf should not be at the end of your piping next to your filter. You need to have it closer to the engine versus on the end near filter. The airflow readings are to unstable right next to the filter.

Jul 27, 2009 | 10:09 AM

#15

Slowhawk

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From: Bridgewater,Ma

Quote:

Originally Posted by thunderstruck507

you say placement of the MAF, where should or should it not be?

Depends on the car BUT most cars with transplanted motors need a tuner to remap the MAF curve to work with the airflow.MAF placement affects the MAF readings. Not hard to do.

Jul 27, 2009 | 10:54 AM

#16

WSsick

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From: St. Peters, MO

cant remember the last time i saw an AFR that large. def follow what slowhawk said, esp since its a transplant

Jul 27, 2009 | 12:02 PM

#17

apex_7

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I had a K&N cone bolted to the MAF for the dyno pull, so that's definitely a possibility. I called TSP, and they said to check for vacuum leaks around the intake manifold w/ carb cleaner.

I'm installing a wideband soon and borrowing a friend's hptuners, so I'm studying **** on the hptuner boards all this week at work.

Thanks for the replies fellas!