Top fuel tuning .

Top fuel tuning .

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Discussion

Furyous

Original Poster:

19,283 posts

182 months

Friday 15th September 2006
quotequote all
Ok, I understand the basics of how a fuel car works.
What fascinates me, is the car's tuner, saying, yep, we have put a 4.84 into it (etc etc)

What are the finer intracacies of fuel tuning ?

I know there are timer on the clutch, but are they able to channge the drive ratios on the blower with different gears ?

How about tuning the fuel pumps ?

Your thoughts please gents.

F

Nitro-besty

2,979 posts

197 months

Friday 15th September 2006
quotequote all
There's a couple of PH members who know about this kinda stuff, but might be at Shakey all weekend so replies wont be til Sunday(ish).

I tend to keep to the simple stuff, single small pump, single mag with no adjustment and not much overdrive. Low nitro loads too (80% in mine anyway). That's worked since the stoneage, so is fairly safe (famous last words).

Generally if you wanted to up the tune-up for a track that was giving better conditions that you initially thought, you'd bring the clutch in quicker and harder, but at the same time adding more fuel to compensate and more aggression in terms of timing.

A big amount of timing at the hit (say upwards of 50 degrees advance at the hit) and a small tail off around 40ft out before it coming back in sometimes works (more so in a Funny Car where you need it to dig in hard to get out the hole). If the weather's crap you may end up winding the timing up to a scary amount (76 degrees advance is the most I've heard of in Europe). The blower drive will be adjusted for good tracks, but isn't as good a tuning feature due to the fact it'll reap more power all over which needs to be calculated for in the above clutch, fuel and ignition settings. At the best of times, you'll have to weigh up 3 or 4 fundamental things just to push it with one aspect.

That's how I understood it anyways, might be all wrong though, blonde moments and all that lol.

Besty.

Flying toilet

3,621 posts

172 months

Friday 15th September 2006
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P1ston or Pete Knight! This ones for you! Good to see you here Pete. Everything ok?

p15ton

409 posts

197 months

Sunday 17th September 2006
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Yes, mate I'm fine, good to see you still about, & in celebration of the new forum, I've updated my profile with a picture of a high performance car I had a hand in....

Top fuel tuning involves setting fuel flow, Nitro percentage, blower overdrive, ignition timing, engine combination, 5 disc clutch, clutch disc rockwell hardness, floater 'cutter' design, clutch base weight, cannon speed, stall speed, 12 fuel timers, 6 clutch timers, six magneto timers, port, manifold, hat & return jet sizes in such a manner that in under 5 seconds, all work in complete harmony to get your car down the track faster than any other vehicle, & hopefully structurally & financially complete.
Hope this helps!

TheMighty

584 posts

172 months

Tuesday 19th September 2006
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Could we add wing angle to that Pete?

Or do you think that would be far too politically incorrect?

CP

dragnut

40 posts

172 months

Tuesday 19th September 2006
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I have the NHRA drag racing championship game from 2005, and all you have to do is to click some buttons on the controller and your away. My PB is a 4.284@337mph. No-one in real life has set that yet though, so im quite proud!

furyous

Original Poster:

19,283 posts

182 months

Wednesday 20th September 2006
quotequote all
TheMighty said:
Could we add wing angle to that Pete?

Or do you think that would be far too politically incorrect?

CP