all motor done - power less than expected

[huguetguy]

Rosen Autosport here in richmond recently finished working on my all motor engine and installed it. But the dyno results are much lower than I expected:

155 RWHP, 148 TQ on 93 octane pump gas

... and this is with the following:

1996 KA24DE (head port & polish), 0.040 overbore, 10:5 compression w/ JE pistons, JWT ECU, JWT Camshafts, UR underdrive pully, Hotshot Headers, Injen CAI Intake, AIV/EGR block off kit.

doesn't this seem low? should investigate a problem somewhere that's causing such low numbers?

Dave

[I am Technoman]

MY KA made 148hp 142 torque in a 97 degee dyno room with no bottom end work stock compresion and 248 degree cams.]with a stock ECU. there somthing going on man! you should be very close to 200hp...

[Dori Dori]

Don't freak out. I could be the dyno. If you can, run it somewhere else.

How's it feel?

[huguetguy]

it doesn't feel much different than before...and I've had to take it back 3 times for various idling/stumbling problems...they seem to be fixed now, but the power isn't as great as I thought it would be...

[jrc90240sx]

how long have you let it break in?

[huguetguy]

jrc90240sx: It's got about 600 miles on it now, the oil's been changed and it was dyno'ed about 500 miles after the oil change. do you think there'll me more change after a longer break in period?

[jrc90240sx]

maybe a little, but not much. dont know what to tell you. maybe JWT messed up on the reprogram. try going back to the old chip and see what it runs like.

[Aries]

first try the stock ECU instead of the chip.second, try a different dyno.if it all stays the same, have the shop check to make sure they got the cams in properly, and didnot switch the intake cam with the exhaust cam by accident.

[95_240sx]

They have the same specs for the intake and exhaust cam, which are a .390 lift and 275 duration.

But, I would have to say, someone messed up on the engine, with that stuff you should be making way more hp than you are.

Time to buy a turbo?

Rick

[huguetguy]

what kind of HP should I be making??? How do I go back to them and say, "You screwed up" without some sort of proof...

and with the higher compression, if I switch to the stock ecu, won't that be dangerous?

Dave

[PapaSmurf2k3]

try dynoing it at the crank, maybe there is something messed up with your other stuff... like your ebrake is on or something who the hell knows.

[95_240sx]

Engine dynos are expensive. When going back to them, just get to thinking about how frustrated you were when you saw you got 155rwhp with all that money invested into the engine, THEN go back and get after them, make them stand behind their work.

Rick

P.S. Anyone got a stock KA Flywheel they wanna sell me?

[Lepchitz1]

P.S. Anyone got a stock KA Flywheel they wanna sell me?

i got a stock flywheel you can buy...E-mail me and well discuss pricing.... [email protected]

I also have a clutch and shifter as well....clutch and flywheel have 30k on them

[I am Technoman]

If I were you I would put the stock ECU back in use race gas and see what it feels like. you shouldnt have a pinging with the right fuel....

[I am Technoman]

And how can you go 40 over on the bore size? are your pistons 96 mill? is'nt the max 20 over?

[huguetguy]

Um, huguetguy, did you not bother to do a baseline dyno run before the changes?

Actually, I have a few baseline runs, before I put on the header, and after the headers. this engine wasn't the same engine, it was a 96 KA that they ripped apart to do the headwork and overboring, so there's no way I could do a baseline for that particular engine...

[huguetguy]

this is my pathetic dyno chart for those that want to see how bad the engine's running...

[nismo240]

i agree with all of you guys.....i also would have them check the cams and make sure that they have the intake and exhaust cam on the right side.....

[C-Kwik]

i agree with all of you guys.....i also would have them check the cams and make sure that they have the intake and exhaust cam on the right side.....

If that were the case, the engine would not run. The valves would be opening and closing at the wrong times. I'd say it's only slightly on the low side, but not out of the range of what I would expect. Perhaps do a compression check to see how well the rings are sealing.

[JNM240]

And how can you go 40 over on the bore size? are your pistons 96 mill? is'nt the max 20 over?

No, KA24(D)E stock pistons are 89mm the STROKE is 96mm, standard overbores are 89.5mm and 90mm. His overbore is .040", or 90.016mm, just slightly larger than a standard overbore and would give him a final displacement of 2443cc's, assuming he had no chaning in his head.

But, unless you went to them and specifically told them that you wanted to have a 200RWHP engine and THEY came up with the bore size and compression ratio and all, you wont get too much out of them. They did their end of the job, rebuild the motor and made sure it runs. If the power isnt to your liking and you chose the bore and the final compression ratio, i doubt they will do anything. On the other hand, you have a brand new engine that should last many many years to come. You could think about some headwork, like porting and polishing the intake and exhaust ports. You could look into some dual electric fans, some larger cc injectors, an exhaust. Theres still a lot that can be done to your car to make it faster.

[Dattebayo]

jnm he said he had a port and polish done by the way. i just think you got scammed cause someone got lazy. Seriously i have mad more power with less mods than you so something has to be up (but im running 104 octane and no ecu upgrade). Another thought...make sure what jwt programmed the ecu for on compression and stuff matches what you have.

[huguetguy]

yeah, I'm going to call jwt and JE pistons today and check what exactly they did/sent me... I wish I had been personally involved in the process now instead of letting the shop handle everything...

Dave

[I am Technoman]

In order the hit the 200rwhp mark you would need 11.5.01 compression. And cams.with lift of around 258 both sides 370cc injectors jwt fuel pressure reg and a good fuel pumpAnd porting the head ports would help alot!

[perpetual gyro]

In order the hit the 200rwhp mark you would need 11.5.01 compression. And cams.with lift of around 258 both sides 370cc injectors jwt fuel pressure reg and a good fuel pumpAnd porting the head ports would help alot!

what cams have that lift? I know the nissan motorsports cams are 238 degrees. What is the difference in performance between say, 238 degrees, and 258?

[doctorj240]

nismo cams are 248 degrees w/ a .390" lift

[perpetual gyro]

how are they, and how's the idle on them?

[I am Technoman]

I use the Nissmo cams and I got 12hp to the wheels on the dyno

They pull real hard from 3k to 6k

[I am Technoman]

I use the Nissmo cams and I got 12hp to the wheels on the dyno

They pull real hard from 3k to 6k

The idle sounds very nice...

[HowdeeHo]

If that were the case, the engine would not run. The valves would be opening and closing at the wrong times. I'd say it's only slightly on the low side, but not out of the range of what I would expect. Perhaps do a compression check to see how well the rings are sealing.

This is what I'm thinking, also check your spark plugs, make sure they're firing properly.Cause with as much as you've had done you should at least be in the 165-170HP range.

[jrc90240sx]

here is a dumb one, what is your elivation? I know that here (utah) i would most likely dyno anyware from 5-15hp less then someone at sea leavel.