re-tune?
Thread Starter
Racer
Joined: Oct 2015
Posts: 265
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re-tune?
As some may remember, my 98 vert was fitted with a Novi 1500 kit this summer. It is tuned with the MAF sensor intact, and as expected the tune has maxed out the MAF signal. Bone stock engine, we ended up at 481/450 at the wheels, even if we dialled the rev limiter back to 6000 rpm (leaning out a little bit from 5500). As ECS says, we should be able to up the hp/tq to around 500/480 with a closed loop / speed density tune without MAF and with a 2/3 bar MAP sensor.
The question is, should I do it? Will I sacrifice anything with the SD tune? The car's running great and like stock out of boost, and I'm not sure I will feel the 5% or so added power. What about fuelconsumption?
Thoughts appreciated...
The question is, should I do it? Will I sacrifice anything with the SD tune? The car's running great and like stock out of boost, and I'm not sure I will feel the 5% or so added power. What about fuelconsumption?
Thoughts appreciated...
Last edited by CorvetteC5Norway; Nov 15, 2017 at 09:57 AM.
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
A properly tuned closed loop speed density tune will not feel any different to the driver. Fuel consumption will be the same as the car will always correct itself to 14.7 at cruise and idle anyway.
Where an SD tune shines is from 100 KPA (ambient) to your max boost level once you have ran out the MAF sensor. An SD tune allows you to tune inbetween those area,s where as "raping the PE table" as it's called once the MAF is ran out will only allow you to run the same fueling from 101 KPA to whatever you max boost level is. For conversation lets say that number is 165 KPA or roughly 9 lbs of boost. So if your throttle position is 100% then the fueling is perfect, but say you are at 90% throttle and you are only making 3 lbs of boost, then the car will be a little rich.
You are at higher RPM's and into boost so it really doesn't matter, but good is good and better is better.
I hope that helps.
Where an SD tune shines is from 100 KPA (ambient) to your max boost level once you have ran out the MAF sensor. An SD tune allows you to tune inbetween those area,s where as "raping the PE table" as it's called once the MAF is ran out will only allow you to run the same fueling from 101 KPA to whatever you max boost level is. For conversation lets say that number is 165 KPA or roughly 9 lbs of boost. So if your throttle position is 100% then the fueling is perfect, but say you are at 90% throttle and you are only making 3 lbs of boost, then the car will be a little rich.
You are at higher RPM's and into boost so it really doesn't matter, but good is good and better is better.
I hope that helps.
Instructor
Joined: Aug 2013
Posts: 122
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From: Mississippi
I had my C5Z SD tuned back in march. Runs and drives exactly as it did before. I can't comment to fuel mileage because I don't daily drive it. And I drive aggressively when I do. As far as a retune goes I don't know that it would be worth it now since it is running fine. I would probably wait and if you add meth and pull the restrictor in the future, then go with the SD tune.
Thread Starter
Racer
Joined: Oct 2015
Posts: 265
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I have to put my car almost back to stock every other year for inspection, so a meth kit I think is out of the question because of the complexity. I'm thinking maybe stage 2 will be rods/springs, longtubes and then retune with SD. What power can I expect with the addidtion of longtubes and a SD tune?
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Racer
Joined: Oct 2015
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Melting Slicks
Joined: Jul 2014
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From: Virginia
I have to put my car almost back to stock every other year for inspection, so a meth kit I think is out of the question because of the complexity. I'm thinking maybe stage 2 will be rods/springs, longtubes and then retune with SD. What power can I expect with the addidtion of longtubes and a SD tune?
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
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Thread Starter
Racer
Joined: Oct 2015
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Thanks for the tips. My car has 45' miles on it, and no issues with valvefloat, so I will just forget that part :-)
As for the Meth, I live in Norway where it rains from time to time
,
so to I will need my washerfluid intact....any other options for meth-tank?
As for the Meth, I live in Norway where it rains from time to time
,so to I will need my washerfluid intact....any other options for meth-tank?
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We typically still use the washer tank for meth so it comes up on the dash when low still, and then use a smaller universal tank and pump for the washer fluid.
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Thread Starter
Racer
Joined: Oct 2015
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I asked a question about the C5 ECU differences in the tuning section, and one guy there gave an answer and also added info around different tuning methods. If I understood correctly, the SD tune is unable to correct for different "environmently" differences like altitude for example. How will this affect the car if I go for a drive in the alps up to 6-7000 feet?
Thread Starter
Racer
Joined: Oct 2015
Posts: 265
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In my case, where I have a functioning "maf" tune, can a knowledgeable tuner convert that tune into a SD tune, or is it a hole new process on the Dyno from scratch? Of course I will have to remove the maf and install a 2 or 3 bar map sensor...
Thread Starter
Racer
Joined: Oct 2015
Posts: 265
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I'm considering this plan right now; I will now buy a 100 mm LS3/7 MAF rebuild kit and dyno/tune with this in the spring. That should give a healthy tune and max out the potential in the car and ECS kit with the restrictor. Hopefully with rev limiter back to 6250 it will put me just north of 500 rwhp. I will then drive and enjoy it for 2 seasons until next inspection is performed.
I will then consider to buy headers, a meth kit, slim or remove the restrictor and retune speed density or whatever tune that is the best for the next level. I guess that should put me at about 550 rwhp which I've understood is the limit for the stock Ls1.
I will then consider to buy headers, a meth kit, slim or remove the restrictor and retune speed density or whatever tune that is the best for the next level. I guess that should put me at about 550 rwhp which I've understood is the limit for the stock Ls1.
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Joined: Oct 2004
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
I'm considering this plan right now; I will now buy a 100 mm LS3/7 MAF rebuild kit and dyno/tune with this in the spring. That should give a healthy tune and max out the potential in the car and ECS kit with the restrictor. Hopefully with rev limiter back to 6250 it will put me just north of 500 rwhp. I will then drive and enjoy it for 2 seasons until next inspection is performed.
I will then consider to buy headers, a meth kit, slim or remove the restrictor and retune speed density or whatever tune that is the best for the next level. I guess that should put me at about 550 rwhp which I've understood is the limit for the stock Ls1.
I will then consider to buy headers, a meth kit, slim or remove the restrictor and retune speed density or whatever tune that is the best for the next level. I guess that should put me at about 550 rwhp which I've understood is the limit for the stock Ls1.