Low power at 15psi. With dyno graph

[HighCaliberJordan]

Hey guys!

So I finally have finished my build. We strapped it to the Dyno and it was just an absolute dog.
Here is the build
Gen 2 engine from a 2008 BK 5k miles
Holley HP Ecu
Aeromotive A1000 fuel system with 1:1 fpr
E-85 fuel
MPS fuel rail
82lb injectors
JE 8.7:1 Forged pistons
Base spacer
Comp CTCTR5858 Air Cooled Turbo. T3 .63 housing with polished Compressor Housing (E-Cover)
Tial blow off valve and wastegate
3” straight pipe exhaust
Upgraded ape valve springs
I took the head in to have it milled and 5 angle valve seats.



We did a few pulls and at 4psi, it was making 125hp.
We have turned it up to 15psi and are getting 207hp. Something does not seem right at all here. Does anyone have any ideas? Do you think I put the camshaft chain on off a bit? Is there any adjustment to the timing to accommodate for the base spacer?
Any idea of where to start looking would be greatly appreciated.

 

[ottafish]

Let me understand ...

You have low comp 8.7:1 pistons, and also a spacer plate?
I may be getting on in years, but wouldn't that give you super low compression?
Just for S&G's, have you done a comp test on any of the cylinders?

 

[01smokes]

You are probably making exactly what you should with 6:1 compression lol.

 

[busakiller]

Yea with a gen 2 motor you don’t need a spacer plate. I’m surprised the motor even runs. Lol. I would toss that spacer. Also I would check your piston to valve clearance now.

 

[HighCaliberJordan]

Well poop, the VERY reputable companies on this forum were the ones who suggested the JE 9:1 pistons. I was told I needed the base spacer to run these pistons.
Do you guys think that removing that base spacer would yield over 100whp improvement? For the Gen 2 engine, it appears the JE pistons are either going to be 9:1 or higher than factory compression.

Should I turn the boost up? It still has stock rods. That makes me nervous.

 

[RedBull]

207 wheel horse power !

That is pretty good *

Go ride it Now !

 

[202mphbusa]

Hey guys!

So I finally have finished my build. We strapped it to the Dyno and it was just an absolute dog.
Here is the build
Gen 2 engine from a 2008 BK 5k miles
Holley HP Ecu
Aeromotive A1000 fuel system with 1:1 fpr
E-85 fuel
MPS fuel rail
82lb injectors
JE 8.7:1 Forged pistons
Base spacer
Comp CTCTR5858 Air Cooled Turbo. T3 .63 housing with polished Compressor Housing (E-Cover)
Tial blow off valve and wastegate
3” straight pipe exhaust
Upgraded ape valve springs
I took the head in to have it milled and 5 angle valve seats.



We did a few pulls and at 4psi, it was making 125hp.
We have turned it up to 15psi and are getting 207hp. Something does not seem right at all here. Does anyone have any ideas? Do you think I put the camshaft chain on off a bit? Is there any adjustment to the timing to accommodate for the base spacer?
Any idea of where to start looking would be greatly appreciated.
View attachment 1645926

Cams were not degreed?

 

[busakiller]

From what you have listed I would have to say the base spacer has to go. If you running turbo pistons on a gen 2 you don’t need the spacer. If it was a gen 1 you need the spacer for turbo pistons. If you assembled the motor you should of notice how far down that piston sat in the hole at tdc. Pull the spacer and check pvc and make sure nothing is going to touch since you shaved the head down. Also have the fuel injectors cleaned since those could be gummed up or something. I never would of turned the boost up. If it doesn’t make over 200 on 4psi or close to it you got something wrong. That’s for sure.

 

[VIPER]

Ya something wrong there. Im making 267 on stock pistons no spacer plate at roughly 5 to 7 psi boost. I am also tuned on e85. which i dont suggest unless you plan on buy 5 gallon cans of fuel all the time.

 

[moko]

Yea i agree, take spacer out, and see what itll do... If want more power after that, turn up boost

 

[HighCaliberJordan]

Well…. I am going to find out either wag. Tuner just called me and something went in the cylinder. Ground electrode melted off and now I have a dead cylinder.

Guess it gives me a reason to replace the connecting rods and throw a lot more boost at it.

It appears the JE pistons are the only boost pistons for the Gen2 people run. I only see the 9:1 option. Does anyone else run something different with a forged Gen2?

 

[michael parris heuberger]

Well…. I am going to find out either wag. Tuner just called me and something went in the cylinder. Ground electrode melted off and now I have a dead cylinder.

Guess it gives me a reason to replace the connecting rods and throw a lot more boost at it.

It appears the JE pistons are the only boost pistons for the Gen2 people run. I only see the 9:1 option. Does anyone else run something different with a forged Gen2?

Hi. I have a Gen 1 stroked 2mm with a marine crank. I have JE 10 to 1 turbo pistons custom made as I lowered the top ring .080th I also have Cerrillo custom rods made for 20mm pistons pins and 13500 RPM and 1000 HP. They can make anything you need.

 

[202mphbusa]

wossner makes 81mm and 83mm

K8736DA-4	1340cc	81mm	STD	9:1	202	RIK81.00A	WP064	CW18
K8736D200-4	1407cc	83mm	+2mm	9:1	223	RIK83.00A	WP064	CW18

 

[shade]

Yes Wossner pistons are low compression. Good hardware.

 

[01smokes]

Also the bike is on e85 I personally would have left it stock compression and put rods and pistons in it and left the head stock. The e85 is gonna be super hard to melt a piston on. The weak link is definitely the rods

 

[01smokes]

Ya something wrong there. Im making 267 on stock pistons no spacer plate at roughly 5 to 7 psi boost. I am also tuned on e85. which i dont suggest unless you plan on buy 5 gallon cans of fuel all the time.

There is nothing wrong with pump e85. If you are really pushing limits I'd say ya go with race e85 but for anything under like 450 wheel regular ol pump e85 is plenty. It's so so so hard to hurt a piston on e85 even if it swings from e60-e85 the tune shouldn't be to far off unless you are on the ragged edge of your AFR as it is.

 

[VIPER]

Ya i was more saying because of the swing in ethanol content driveability is effected. Bike runs like garbage when the swing is more on the low side, hard starts etc

 

[GIXERHP]

AS 202 asked are the cams degreed?

No mention of adjustable sprockets in you build list

 

[HighCaliberJordan]

I don’t recall adjustable sprockets as part of the build. Is that necessary with the spacer? Do I need them if I remove the spacer?

 

[ColdBusa]

Adjustable sprockets are not required or necessary. But you can get more power by adjusting your cams more aggressively. You should be seeing way more power than you are now with stock set cams and the boost you are pushing. They are not the problem.