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Thread: Anything you ever wanted to know about tuning and electrical systems...

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Posts: 11-20 of 88
2010-01-15 17:20:06
#11
Originally Posted by danmartin
Where is your IAT sensor? I wended a bung on the bottom of my plenum to hide it and to get the most accurate temps. I would try to shoot for a good 12-18 inches just so the meth/water has some time to atomize. Generally the further you can go the better.

The whats more important is you don't have the meth injection close to a downward slope. I have seen intercoolers with water in them before


The plenum sounds like a good idea for the iat. Might have to make a trip to see you for that. I have all my parts but am still trying to figure things out before I start to assemble the motor and setup.
2010-01-15 17:21:47
#12
Yeah you can bring anything you want by, if you do it yourself on my equipment i wont have to charge
2010-01-15 17:22:53
#13
Originally Posted by danmartin
Also something to think about. Since there is no point at which you actually use closed loop control while injecting water/meth its not really going to matter unless you yourself want accurate charge temp readings.

Yes MAP based fueling algorithms do take IAT into account you the end use have the final say in fuel.

Its only tricky if you have temp based retard for timing, where you want to make sure you are getting your full timing


I had planned on talking to you or ben on this. This will be my first car with map and iat. So I am sure I will have a ton of questions. Also do not want to tune the car with out some experieced supervision
2010-01-15 17:23:51
#14
I'll be glad to help! It's cake really... seriously.
2010-01-15 17:24:38
#15
Originally Posted by danmartin
Yeah you can bring anything you want by, if you do it yourself on my equipment i wont have to charge


dan my welding is real ugly. So I think you will be charging me.
2010-01-15 17:26:57
#16
Psh, Ill put you on the MIG with the spool gun, its real easy and if you put it on the bottom, who cares? You won't see it
2010-01-15 17:28:50
#17
Originally Posted by danmartin
I'll be glad to help! It's cake really... seriously.


Just nervous about doing my first stand alone. I am sure I can learn but its always better to be cautious. Done basic tuning with piggy back units but this is way more complex.
2010-01-15 17:30:15
#18
Originally Posted by danmartin
Psh, Ill put you on the MIG with the spool gun, its real easy and if you put it on the bottom, who cares? You won't see it



Ok dan, but I telling you my self taught skills are sad.
2010-01-15 18:23:39
#19
Originally Posted by danmartin
At what RPM? Timing is a function of RPM too. You want to have lower timing down low because you have slower piston speed. The flame front has more time to propagate. At higher RPM you need to compensate by giving more timing so the mix so it has more time to burn fully.

Knock sounds like rocks shaking in a can.

But yes 25* at high rpm is a good starting point.


That makes sense. The RPM max on that I have on this map is 6800. This seems to be the usual max for the 7500rpm reving SR20's.

Now lets say update my maps to account for higher RPM rev's. At 6800rpm 28* will knock, but I should be able to run 28* at 7200rpm. Right? Just hypothetical thinking hehe

One thing I've learned so far, from talking to Ben and doing a good bit of research and just simply driving around while map tracing, is that paying attention just to the highest WHP numbers, but the power band to get up to that point will still be lacking. I wish I knew this last time I went to the dyno hehe .

I'm starting to pay more attention at lower-mid range RPM timing, but then carefully morphing it into the higher RPM timing.

Originally Posted by danmartin
Also guys keep in mind, timing is a function of flow and charge temps, not pressure


Now whats up with dropping the timing with more boost then?
2010-01-15 18:27:17
#20
Also onto the next agenda, the peak detonation point, aka the peak torque spot. From what I've learned you can have rather high timing below the peak torque, but then right after it you have to start lower and then you finally build up the timing to the high RPM mark.

Here is an example from a DET map from Calum.

6800 23
6400 23
6000 21
5600 19
5200 19
4800 19
4400 19
4000 17
3600 17
3200 16
2800 12
2400 12
2000 12

1600 13
1200 13
800 14
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