No low end power?
Thread Starter
Launching!
Joined: Nov 2001
Posts: 286
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From: St. Louis
No low end power? I'm going to take one more stab at this before I switch back to the bottle. I recently switched to the D-1SC kit from a 125 shot. I'm getting 6#'s of boost with the 3.85" pulley. My horsepower is peaking right around 500 at the wheels but it doesn't have any low end power. My rwtq is only 414 and the horsepower curve is extremely weak compared to my last bottle pull. I also lost .6 tenths at the track when I switched to the blower. My current setup looks like this- stage II heads and T1 cam (221/221 .558/.588 112) LT headers with true duals and dumps, and all the usual boltons. Any clues as to why this thing isn't putting down the #'s at the track. Traction is not an issue.
Re: No low end power? i'll take a stab at it, your lobe seperation on the cam is pretty tight.
you also might want to check your oil for bubles after a WOT to see if your oil pick up tube O-ring is damaged.
you also might want to check your oil for bubles after a WOT to see if your oil pick up tube O-ring is damaged.
Thread Starter
Launching!
Joined: Nov 2001
Posts: 286
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From: St. Louis
Re: No low end power? The cam would have an effect on boost, but for what I'm getting, I would think it would have a fatter curve. As far as the oil pickup tube, can you elaborate a little? How would I check the oil for bubbles?
Thread Starter
Launching!
Joined: Nov 2001
Posts: 286
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From: St. Louis
Re: No low end power? Do you guys think the R1 cam (232/236 .575/.579 114) would help with the problem? I've got that one sitting in my garage. I was going to use it with the motor I'm building.
Re: No low end power? pull the dipstick out, if there are bubbles in the oil on the dipstick then you have an airation problem.
what happenes is that the oring on the oil pick up tube ( where it enters into the pump) gets cut or torn (or in my case: forgot to put it all together) and as the oil pump starts to pull in the oil , it sucks air through the gap that the oring was supposed to seal.
what this does is collapse your lifters at high rpm , thus netting you with less duration and lift( almost like a V-tech system , but in reverse). this causes your power/torque curves to peak early and low.
i know that cause it happened to me.
what happenes is that the oring on the oil pick up tube ( where it enters into the pump) gets cut or torn (or in my case: forgot to put it all together) and as the oil pump starts to pull in the oil , it sucks air through the gap that the oring was supposed to seal.
what this does is collapse your lifters at high rpm , thus netting you with less duration and lift( almost like a V-tech system , but in reverse). this causes your power/torque curves to peak early and low.
i know that cause it happened to me.
TECH Senior Member
Joined: Nov 2001
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Re: No low end power? 232/236 .575/.579 114 would definitely help with the problem 
You didnt mention tuning? did you get LS1edit tuning on the dyno? What compression are you running? Fuel/timing etc?
What was your best ET/mph with the blower?
thanks,
Chris
You didnt mention tuning? did you get LS1edit tuning on the dyno? What compression are you running? Fuel/timing etc?
What was your best ET/mph with the blower?
thanks,
Chris
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Re: No low end power? I dont think its the cam. Nitrous and centripetal superchargers have completely opposite powerbands. Nitrous make large amounts of torque whereas superchargers make their power later in the powerband after the boost builds up.
A different cam may help but its still not gonna give you the power curve of nitrous.
A different cam may help but its still not gonna give you the power curve of nitrous.
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Launching!
Joined: Nov 2001
Posts: 286
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From: St. Louis
Re: No low end power? Ed Wright did my tuning. Right now I'm getting around 10.3:1 compression. Not sure about the timing, I've got an autotap on the way so I'll know soon. I went 11.1@125 with the blower but I went 11.4@121 on the motor so I'm not getting much out of this thing. I'm kind of at a crossroad, I've almost got my 421 iron block finished and I'm not sure whether to keep messing with pullies and cams or just go back to the spray. I'd rather stay FI but I gotta go with what works. Thanks for all the input, I'm ging to call Procgharger in the morning and see what there thought is on this.
10 Second Club
Joined: Apr 2002
Posts: 1,755
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From: Cincinnati, Ohio
Re: No low end power? 6 lbs. of boost isnt that much. I had a dramatic power increase going from the 5 my g-trim was making to the 11 the t- trim made. I know that your not seeing much diff, from the motor to the blower but your numbers arent that disappointing. If you look at the top 100 list the nitrous cars rule for all out speed. You'll see a huge diff, if you can get your boost to10lbs.
Thread Starter
Launching!
Joined: Nov 2001
Posts: 286
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From: St. Louis
Re: No low end power? Well I talked to Procharger today and they said everything sounded normal to them. They said the T1 cam should work fine with the kit and that 6#'s is 6#'s, even though it doesn't put the #'s down at the track I'm getting 500rwhp so there's nothing wrong. Next time I'll call my mailman for advice. 
Oh well, one more try at the track then I'm moving on to direct port. 
Oh well, one more try at the track then I'm moving on to direct port. 10 Second Club
Joined: Apr 2002
Posts: 1,755
Likes: 2
From: Cincinnati, Ohio
Re: No low end power? Do you use race gas? Are you just boosting at 6 because of detonation due to your 10-3:1 comp.? I don't know of anyone here in the 10's with only 6lbs. boost. Why not go higher with the boost and maybe get in the 600hp range and see how you do.
Re: No low end power? Hard to say... Maybe you need to shift faster to stay in boost? Blower car will have more power up high and like rpms vs the a nitrous car getting shifter lower since you will build a ton of low-mid torque.
Moderator
Joined: Nov 2001
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From: Raleigh, NC
Re: No low end power? I haven't seen your dyno, but with such low torque, it sounds like that 500 rwhp may be peaking late in the game? That may also be why the power seems low on the bottom end. You need more boost at the bottom of your rpm range.
Either you need more stall or if you are M6, you need to keep the RPMs up in the higher RPM range. Large torque numbers are going to likely come from the lower RPM values having a lot of power down low. I agree you need more boost... maybe 5 PSI by 4800 or so and peaking wherever it's going to be at shift-time... maybe between 8 and 10 PSI.
Either you need more stall or if you are M6, you need to keep the RPMs up in the higher RPM range. Large torque numbers are going to likely come from the lower RPM values having a lot of power down low. I agree you need more boost... maybe 5 PSI by 4800 or so and peaking wherever it's going to be at shift-time... maybe between 8 and 10 PSI.
Thread Starter
Launching!
Joined: Nov 2001
Posts: 286
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From: St. Louis
Re: No low end power? Good points everyone. I thought about just running more boost or putting a 50 shot on it to get the torque up. I'm running 100 octane at the track just to be safe. I'm not hearing any pinging or detonation and my plugs look great after each pass. I think it all comes down to the way I've got the car setup period. Sometimes it just takes trial and error to see what works with what. Obviously my car runs better on the juice then it does with FI because of my particular combination. I could experiment with different cams, exhaust, pullies, timing, but I really don't have the $$$ for that. I'll give it another try this weekend but if I sell the blower I can finish my motor and have enough left for a new direct port kit. I'll post my times with all pertinent info as soon as I get them. Thanks for all the help.
Jason
Jason
