Dyno Results on my K27/8 + Vitesse MAF
#1
Burning Brakes
Thread Starter
Dyno Results on my K27/8 + Vitesse MAF
For the records, I put the 951 on the Dynojet dyno today to see what she'd do. Recent mods included a Vitesse MAF+Chipboard, SMT6 and K27/8. The car also has a Tial 38mm WG, SFR 3" catback, factory cat converter. Max boost was about 16 psi.
The best run was 284 rwhp, 290 lb-ft torque. A little disappointing, but the car is really quick. The first run was 275rwhp so I played with the fuel a bit between runs to reach the best one. I think I can probably tune a little more power in with the SMT6. The first run (275 rwhp was with a blank map in the SMT6).
By comparison, this same engine last May with stock AFM, Guru chips, K26/6, stock WG and 15 psi boost turned in 217 rwhp/227 lb-ft torque on a Dynapack dyno.
Comments ?
The best run was 284 rwhp, 290 lb-ft torque. A little disappointing, but the car is really quick. The first run was 275rwhp so I played with the fuel a bit between runs to reach the best one. I think I can probably tune a little more power in with the SMT6. The first run (275 rwhp was with a blank map in the SMT6).
By comparison, this same engine last May with stock AFM, Guru chips, K26/6, stock WG and 15 psi boost turned in 217 rwhp/227 lb-ft torque on a Dynapack dyno.
Comments ?
Last edited by brad-cam; 02-15-2006 at 12:29 AM.
#3
Burning Brakes
Thread Starter
The dyno didn't have a boost connection unfortunately, but with my simple Reliaboost MBC set at 16 psi and using the Tial in single-port mode, I think I might be losing some boost (comments?). I'm going to try a dual-port MBC sometime, like the one sold by LR and Paragon, to see if that makes a difference.
#4
hmm i made quite a bit more power with a vitesse setup (older chips not the board and smt6) and k27/8 at 15psi. you don't see horribly rich or lean, what's the compression like on that motor? what gear was the run done in?
#5
Burning Brakes
Thread Starter
Shaheed, dyno run was done in 4th gear. Compression is not great in this motor, I don't think. If I remember correctly, it's something like 135/135/130/118. Cylinder 4 is suspect. The motor was recently rebuilt by me and I may have screwed something up. It runs fine and holds 16-17 inHg warm idle vacuum which I know is a little low. I'm just gonna drive it for a while - it's plenty quick for me. I've got a fresh rebuilt motor on the stand... :-)
#6
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to either of you, (Shaheed or brad-cam) since yall both have the k27/8 with vitesse software, how quickly does the turbo spool - how quickly can you reach full boost?
#7
brad that may be it, i was just curious since i made some 30rwhp more with a similar setup but that motor was in really good shape. aeronautica86 i didn't log boost when i dynoed that particular car, but it hit a torque peak of 314 rwtq at 3500 rpm (boost is set at 15psi). so not the fastest spooling thing around (but that's to be expected with a 27/8), but the power curve is very nice and the car is very quick.
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#8
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Hey Brad
I'm thinking it might also be the stock downpipe/cat robbing you of some spool and power.
What do you think happened on your engine refresh? New rings? Any cyl. prep?
I'm thinking it might also be the stock downpipe/cat robbing you of some spool and power.
What do you think happened on your engine refresh? New rings? Any cyl. prep?
#9
Burning Brakes
Thread Starter
The K27/8 is giving me full boost by about 3500 rpm with 10psi or so by 3100-3200. Not the quickest spooling turbo, but no complaints...
Hey Matt - they mentioned you today at the dyno shop. They don't see many 944's so they remembered you as the last guy to come through with 944 work !
The downpipe may be getting in the way, or maybe just the cat as it's original and who knows what shape it's in. I have a Magnaflow hi-flow cat at a friends place being welded with flanges so I can switch out the cat with a test pipe with the stock down-pipe.
As for the motor, I really don't know what went wrong. I just re-ringed and put it back together. The bores were in excellent shape, at least visually. I did have to force piston #4 into the bore (I got impatient with the ring compressor) and it didn't seem right, but my impatient self just ignored it at the time. I should have taken it back apart. Suspecting maybe a cracked ring, I pulled the head a couple months back to check the bores, expecting a broken ring and trashed bore in #4, but it was perfect like before. Leakdown is terrible on #4 too - my leakdown tool gives erratic results but the result on that cylinder is consistently above 15-20%. I'm suspecting poorly prepared ring lands on the pistons - ie. I may not have cleaned the carbon out of the lands well enough, and maybe on #4, the extra force exerted putting the piston in the bore may have deformed the ring lands, robbing it of a good seal. I just emptied my catch can tonight after several good high speed runs and it had 4-5 ounces of water-oil slurry in it. I don't think that's normal...
All that said, it is running fine, strong (284 rwhp feels real strong) so I'm not too motivated to rip into it...
Originally Posted by Matt Sheppard
Hey Brad
I'm thinking it might also be the stock downpipe/cat robbing you of some spool and power.
What do you think happened on your engine refresh? New rings? Any cyl. prep?
I'm thinking it might also be the stock downpipe/cat robbing you of some spool and power.
What do you think happened on your engine refresh? New rings? Any cyl. prep?
The downpipe may be getting in the way, or maybe just the cat as it's original and who knows what shape it's in. I have a Magnaflow hi-flow cat at a friends place being welded with flanges so I can switch out the cat with a test pipe with the stock down-pipe.
As for the motor, I really don't know what went wrong. I just re-ringed and put it back together. The bores were in excellent shape, at least visually. I did have to force piston #4 into the bore (I got impatient with the ring compressor) and it didn't seem right, but my impatient self just ignored it at the time. I should have taken it back apart. Suspecting maybe a cracked ring, I pulled the head a couple months back to check the bores, expecting a broken ring and trashed bore in #4, but it was perfect like before. Leakdown is terrible on #4 too - my leakdown tool gives erratic results but the result on that cylinder is consistently above 15-20%. I'm suspecting poorly prepared ring lands on the pistons - ie. I may not have cleaned the carbon out of the lands well enough, and maybe on #4, the extra force exerted putting the piston in the bore may have deformed the ring lands, robbing it of a good seal. I just emptied my catch can tonight after several good high speed runs and it had 4-5 ounces of water-oil slurry in it. I don't think that's normal...
All that said, it is running fine, strong (284 rwhp feels real strong) so I'm not too motivated to rip into it...
#10
Burning Brakes
Originally Posted by brad-cam
The dyno didn't have a boost connection unfortunately, but with my simple Reliaboost MBC set at 16 psi and using the Tial in single-port mode, I think I might be losing some boost (comments?). I'm going to try a dual-port MBC sometime, like the one sold by LR and Paragon, to see if that makes a difference.
Tony
#11
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With the right tuning, here is what a K27/8@20psi could do:
At 18psi one should be seeing 310-340rwhp with MAF/MAP, wastegate, exhaust and usual 'bolt ons', something isn't right, and i can see why you are dissapointed with the numbers.
At 18psi one should be seeing 310-340rwhp with MAF/MAP, wastegate, exhaust and usual 'bolt ons', something isn't right, and i can see why you are dissapointed with the numbers.