What RPM are the bigdog 109's with hydraulic roller spinning?

[Scott Atk]

I recently put my car on the dyno (check out the chart and video in my SouthWest section dyno post) My car is no slouch but I really thought I would be able to make power all the way up to 6400 or so. That doesn't seem to be the case. My question is do I have an issue or are my results typical of a hydraulic roller equpped stout 109?
FYI: I have fresh DLS specd valve springs and .120 wall pushrods installed without improvement. My turbo is the older style 70 HPQ with cast wheel. Heads are ported GN1's. Thanks and Merry Christmas!! Scott

 

[Nick Micale]

From my experience with hydraulic roller cams, mine and others, they seem to peak about 5800 RPM. They will run easily to 6400 RPM, but as you have seen, the power drops off.

This has also illustrated to me that hydraulic roller cam grind specs do not affect HP very much. I have seen 212 grinds match the performance range of 224 grinds in the same power band.

The power you and Jason White generate with hydraulic rollers is very impressive! :biggrin:

 

[Ed Valvo]

How stiff are the springs? What lifters are you using?

 

[Ed Valvo]

3 bolt turbo? What exahust housing?

 

[Scott Atk]

Don't remember the exact springs. I'll have to dig out my paperwork. Seems like maybe 925 or 926? The old ones were 941's and these were stiffer for sure. Yes 3 bolt w/85 housing

 

[V6RACER]

I recently put my car on the dyno (check out the chart and video in my SouthWest section dyno post) My car is no slouch but I really thought I would be able to make power all the way up to 6400 or so. That doesn't seem to be the case. My question is do I have an issue or are my results typical of a hydraulic roller equpped stout 109?
FYI: I have fresh DLS specd valve springs and .120 wall pushrods installed without improvement. My turbo is the older style 70 HPQ with cast wheel. Heads are ported GN1's. Thanks and Merry Christmas!! Scott

That seems right in line... On my 9.05 pass I went through the traps around 6400 and 152+

I don't see mine making any more power above that.

 

[Limited87]

I recently put my car on the dyno (check out the chart and video in my SouthWest section dyno post) My car is no slouch but I really thought I would be able to make power all the way up to 6400 or so. That doesn't seem to be the case. My question is do I have an issue or are my results typical of a hydraulic roller equpped stout 109?
FYI: I have fresh DLS specd valve springs and .120 wall pushrods installed without improvement. My turbo is the older style 70 HPQ with cast wheel. Heads are ported GN1's. Thanks and Merry Christmas!! Scott

Scott, I have a DLS specd hydraulic roller 249ci. 71 HPQ billet wheel with ported GN1's. Full weight 3600# car with a 2004r. Ive never had the car on a dyno but my ets and 6400 trap rpm are almost exact to yours. 9.67@142.8 That was with a very poor 1.50 60 ft.

About the only thing in question is maybe our boost leval comparison along with comp ratio. 26#s here on that pass. I was very happy with those numbers and I dont see myself turning it up and pushing it for more.:biggrin:

Brian

 

[bison]

From my experience with hydraulic roller cams, mine and others, they seem to peak about 5800 RPM. They will run easily to 6400 RPM, but as you have seen, the power drops off.

This has also illustrated to me that hydraulic roller cam grind specs do not affect HP very much. I have seen 212 grinds match the performance range of 224 grinds in the same power band.

The power you and Jason White generate with hydraulic rollers is very impressive! :biggrin:

Ive found the same exact thing. The more the duration the higher rpm the peak torque is. Ive yet to see a hyd roller make peak power over 6000rpm in a TR. Throwing boost at it will extend the usable range. Peak torque on mine was 5500-5600@24psi. Imo your better off pulling gear and using the cylinder pressure to get the car down the quarter.

 

[johnplogii]

I shift mine anywhere between 6500 & 7000, and it pulls strong to 7000. Never had it on a dyno though.

 

[Scott Atk]

My shift light is set right now at 6200. I thought my car was still pulling at 6200 but after seeing the dyno chart I don't see any reason to spin it that high. I may be taking Bison's advice I have a 3.50 gear now, so a higher gear might be the answer.
John: You have a hydraulic roller at 65-7000?

 

[Otto J]

Scott, I have a DLS specd hydraulic roller 249ci. 71 HPQ billet wheel with ported GN1's. Full weight 3600# car with a 2004r. Ive never had the car on a dyno but my ets and 6400 trap rpm are almost exact to yours. 9.67@142.8 That was with a very poor 1.50 60 ft.

About the only thing in question is maybe our boost leval comparison along with comp ratio. 26#s here on that pass. I was very happy with those numbers and I dont see myself turning it up and pushing it for more.:biggrin:

Brian

If your crossing at 6400 and only going 142 you better look into your setup unless you are running 3:73s or higher numerical gears.

 

[Limited87]

If your crossing at 6400 and only going 142 you better look into your setup unless you are running 3:73s or higher numerical gears.

My bad Otto your exactly right.. I looked the the wrong log. That was from the first PTC converter that didnt match my combo.

The trap rpm was 5900 on the current converter. 3.42 gear with 29 inch tire. You can basically say it was 143 at 142.82. 1 pass with terrible traction. Is it in the ballpark now in your opinion?

Brian

 

[johnplogii]

John: You have a hydraulic roller at 65-7000?

Scott, yes I do. 885 comp lifters & dual springs on iron heads set up by Dan Strezo.

 

[Red C5]

Not a big dow here but I was spinning to about 6200 in my car.

 

[Scott Atk]

Otto/Bison, You guys have been dynoing the piss out of vehicles lately. Is the dyno graph that I posted in the SW section in line with what you are seeing as far as dropping off prior to 6000? Thanks!

Edit: After reading through the thread, you both basically already answered the question.

 

[Ed Valvo]

Scott,
Do you remember if you have 853 or 885 lifters? 885 are supposed to be for higher RPM use.

 

[Scott Atk]

I have the race lifters, I'm running basically zero lash.

 

[Ed Valvo]

Stock intake manifold with PP? Unless you already have the Champion intake manifold... Comparing one of my dyno graph to your shows my 206/210 roller cam has roughly same peak as yours except your peak is way the heck up there. Mine doesn't drop off as severely as yours though. Looks like something is choking it. Is it my eyes or did it peg 10:1 or richer at the end of the run?

 

[Scott Atk]

All runs were extremely rich. I admit I was scared I want to go back and pull more fuel. I think it will pick up.
I have a ported stock intake with Champion 1" spacer. I'd like to get a Champion intake but can't find a straight answer on a FP regulator that works with it. I have an Accufab regulator now with a -6 fitting welded on the bottom so I want to re-use it if possible.

 

[OneQuikSix]

My Accufab regulator bolted right up to my Champion intake. My only problem was with the factor return line. Since I changed to -6 return line with a 90deg elbow, no problems at all.