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Old 02-01-2005, 02:10   #1 (permalink)
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frown Beginer wants a bit more power...same ol story

Yeap....another novice is after a lil bit more grunt.

Heres the deal so far, 351c mildly skimmed 2v recon heads, edlebrock dual plane manifold (that says nothing more than 351C on it) New Holley 600vs, pacemaker tri Y, twin 2.5", new ignitor (that made a major improvement) 4v cam.

This motor was dynoed pre new carb (the ol 600vs was a quite worn in the moving parts department) and produced 195hp/rw@ 3300 and I think 380lb/feet.

I just think something is holding it back a bit, or maybe a bad combo of ok parts. Is there something simple, cost effective that i'm missing (please don't reply "brain" to that) If I don't ask, i'll never know. Oh yeah, its in an XD with a C4. 3.23 diff

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Old 02-01-2005, 05:02   #2 (permalink)
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Re: Beginer wants a bit more power...same ol story

i would think the 4v cam would definitly not be suited to std 2v heads and a dual plane mainfold. i would either give the heads a good port and put on a single plane mainfold or change the cam. Although even if that was done you would be better off gettin a better cam as well as it still wouldnt be matched the best.

a bigger carby (650/700) might possibly be better aswell

what is the cam? a stock 4v one?

do u have a balance/x-over pipe on the exhaust? these ive heard make a good difference for the cheap price
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Old 02-01-2005, 07:09   #3 (permalink)
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Re: Beginer wants a bit more power...same ol story

If they are open chamber heads, you might want to recurve the dizzy - about 16 initial, 36 in by 3000. I'm not sure what a "4V" cam is, but the typical 214/224 .510/.536 lift cam is a good one for that combo. If you don't have a perfomance converter behind it (like a good 11" 2200~2400 stall) you need to consider that too.
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Old 02-01-2005, 16:48   #4 (permalink)
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Re: Beginer wants a bit more power...same ol story

Might be loosing a bit through that box too, if its standard non-recon.
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Old 02-01-2005, 18:39   #5 (permalink)
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Re: Beginer wants a bit more power...same ol story

The trans is standard (as far as I know), I do have a balance pipe. I might talk to the guy that services the auto, I didn't think any power gains could really be made from it.
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Old 02-01-2005, 20:53   #6 (permalink)
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Re: Beginer wants a bit more power...same ol story

I noticed a huge difference in acceleration when I had my C4 done and new converter.
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Old 02-01-2005, 22:35   #7 (permalink)
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Re: Beginer wants a bit more power...same ol story

Quote:
Originally Posted by xentrix
The trans is standard (as far as I know), I do have a balance pipe. I might talk to the guy that services the auto, I didn't think any power gains could really be made from it.
1/4 wise there is purely but having it shift quicker and harder. Powerwise the way to make extra power is manualise the box.

In a full auto box there is two pumps (simplifying here). One runs the oil everywhere (front pump), they other is in the extension housing an is not required when the box is manualised. Basically the rear pumps removed, oil lines for it removed and the galleries blocked. Just rebuilt and manualised a box myself on Monday.

[edit] A stall convertor is a good way to make an engine launch harder.

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Old 02-01-2005, 22:49   #8 (permalink)
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Re: Beginer wants a bit more power...same ol story

The peak @ 3300 seems a bit odd. ie: It should be climbing almost all the way to max RPM, ie: 5000+ then drop off. You'll probably find the peak tq was @ 3300.

Normally it's the tq curve which drops off earlier (comes in lower and normally stays quite flat). Do you have the cam specs (ie: lift and duration).

Does it rev smoothly and keep pulling all the way to your max rpm? You had on the dyno...........did the guy do anything in the way of tuning it (timing/fuel jets etc) or was it just a HP run?

Call them and ask for the air fuel ratio data. They normally store this on the computer for future reference. Even though you've changed carbs, it would be good to know what it was.

Yeah, dodgy boxes can sap HP. If you do get it redone, get a hi-stall converter as mentioned and a shift kit (stops those long slurrrrrring gear changes and makes 'em snappy).
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Old 02-02-2005, 00:59   #9 (permalink)
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Re: Beginer wants a bit more power...same ol story

What I meant was if the box is stuffed, and the converter is stuffed then It wont be sending all the drive to the rear wheels. If its maxing out at 3300 then there is a fair chance the box cant handle the horses after that and is slipping for the rest of the rev range. Unless the converter is shagged, then you will still get the same result.
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Old 02-02-2005, 01:22   #10 (permalink)
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Re: Beginer wants a bit more power...same ol story

Quote:
Originally Posted by grey_esp
What I meant was if the box is stuffed, and the converter is stuffed then It wont be sending all the drive to the rear wheels. If its maxing out at 3300 then there is a fair chance the box cant handle the horses after that and is slipping for the rest of the rev range. Unless the converter is shagged, then you will still get the same result.
The dyno guy should be able to tell you if this was the case.

They dyno measures the speed of the rollers and a direct km/h speed. That would be very obvious on the recorded results. ie: the rpm climbs as the speed stays constant.

I would think that he'd get an accurate rpm reading from your ingnition? I don't think they normally reverse calculate it thru tyre size and diff gears. Again ask the guy to pull up the dyno file on the computer and see the km/h speed over the same run. They normally do runs using the final 1:1 box ratio 3rd (auto), 4th (man). If the speed says about 200km/h you're good to go. If not, then look into it.
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