Ecu on a 302 to a 306

[Storm13_5.0]

If I bore my motor out to a 306 what if any work will need t be done web it comes to the ecu?

[NeedSomeMods]

I would suggest a custom dyno tune, especially if it's for the sn95 5.0. Your stock computer will work, but adjustments to timing curve, A/F ratio, etc. must be made for it to run at it's full potential.

[Storm13_5.0]

Thanks ! How much does a dyno tune usually cost ?

[vinnygt]

Originally Posted by Storm13_5.0

Thanks ! How much does a dyno tune usually cost ?

Usually around 400-500 depending on who's doing it and what area

[Storm13_5.0]

That's not too hatefull, I thought it be worse ... I've herd it will make your car run better then ever

[dreamstang]

Just boring will not require a tune. But with the other upgrades you have been talking about it may.

[Storm13_5.0]

I mean gotta be done gotta be done ! Long as its not a waste

[dreamstang]

Like I said. If you did a stock rebuild .030 over. Then don't do it. If you do hci then well worth it.

[Storm13_5.0]

I plan on hci just to do it all at once ..

[tbonestang]

For the time and money I would just do a 331 and cal it a day

[Storm13_5.0]

But I kinda have to worry about ffuel milage a lil bit

[dreamstang]

If your motor is properly built with the right parts then I wouldn't worry to much about mpgs. They won't change to much.

[Storm13_5.0]

Sweet that's always good to hear lol

---------- Post added at 09:18 AM ---------- Previous post was at 09:17 AM ----------

I got 20 off my last tank

[Trojan Horse]

A better performing engine is usually more efficient.The big losses in fuel mileage are usually caused by poor tuning and/or a heavy right foot.


Driven conservatively I can eke around 24- 26 MPG out of my much modified 86' GT.

[Storm13_5.0]

So the HCI and 306 rebuild if it's done right won't kill my fuel milage ?

[Trojan Horse]

Originally Posted by Storm13_5.0

So the HCI and 306 rebuild if it's done right won't kill my fuel milage ?

Nope.


I don't know what my car was capable of before all the mods, but I doubt it was much if any better.

[Storm13_5.0]

This is good to hear

[dreamstang]

Originally Posted by Trojan Horse

A better performing engine is usually more efficient.The big losses in fuel mileage are usually caused by poor tuning and/or a heavy right foot.

Driven conservatively I can eke around 24- 26 MPG out of my much modified 86' GT.

but you forgot to mentioned, with a more modified motor its harder to keep the foot out of it.

[Trojan Horse]

Originally Posted by dreamstang

but you forgot to mentioned, with a more modified motor its harder to keep the foot out of it.

Yeah, there is that issue to contend with.

[Storm13_5.0]

True that!

[WhiteCobra94]

Originally Posted by Storm13_5.0

Thanks ! How much does a dyno tune usually cost ?

My car was dynoed 3 weeks ago and cost me $450 but I already had a chip from SCT so if you need to buy the chip too your looking closer to $600 for Chip and custom tune!!

[Storm13_5.0]

Damn.. Not too cheap..