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Is it possibly to convert to the z06 maf and they have same calibrations as the 99 maf correct? Should be a direct fit. Reason is iat sensor is in maf so would just need the 99 iat/maf sensor adapter harness to new style maf and a parts geek z06 maf for 46$. Descreened of course would be the way to go as it was tuned with the factory 99 descreened maf.
It says upgrade you early maf to the later bigger z06 maf? What size is the z06 maf and base model ls1 maf? and would calibrations mess up?
Upgrade your early C5 Corvette to run a larger 2001 and later style mass air flow sensor. Plug-n-play adapter converts the 1997-2000 3-wire engine harness connector to plug directly into the 5-wire 2001-2004 LS1 MAF sensor. Incorporates the AirTemp connector into the adapter to connect directly to the gray AirTemp sensor connector from the engine harness.
Says plug n play just simply a bigger z06 maf upgrade.
Any reason to not do this and will it mess up the tune as long as the maf is descreened as it was tuned with a stock 99 base model maf which is the same as ls1/lt1 f-body maf sensors.
You can convert a 97-00 to an 01-04 MAF, I wouldn't do a recalibrated plug and play MAF. I would and have used an adapter harness and a used newer MAF, then logged and tuned the MAF table. Some were selling MAFs which were recalibrated claiming a tune was not necessary, not sure if you can still get those. An OEM 01-04 MAF swap would require the MAF table to be adjusted. The tune isn't very hard using HP tuners.
You will not see major gains on a bolt on car. You will see more with heads and cam but it is not a massive change.
Correct me if I'm wrong, but the only difference with the C5 Z06 MAF was that the screen was removed. Otherwise they are all absolutely identical.
Early C5's were tuned a bit rich, so removing the screen leaned the mix a bit and actually produced a couple of horsepower.
Removing the screen on the 2000+ cars had no positive result, and could easily cause negative air turbulance effects when using an aftermarket filter.
Been there done all that.
OH, to clarify: the early mafs didn't have the intregrated IAT sensor, but that had nothing to do with size or airflow compared to the later units.
So, save your money for an '01 or later intake manifold, and make a few real ponies.
So youre saying ls6 intake manifold vs the stock ls1 manifold for extra hp? I seen the ls7 or ls7 slot card maf halltech sells uses no screen. The z06 uses the maf upfront similar to the f-body ls1 camaros and i never had problems with the maf descreened on the 98 z28 i had. I was curious if simply swapped to the z06 or 01+ later bigger maf with iat sensor and the 20$ 5 pin to both iat maf connectors for 99 harness would be direct plug n play no retune required. I just read the z06 maf was bigger and can be purchased cheaper standard motor products or other brands which should be on par with stock ac delco.
No ones swapped to the z06 maf from the base 00-97 with adapter harness? Or ran an ls2 intake with ls2 90mm throttle body drive by wire as it allows more airflow at part throttle 15% vs the stock 78mm.
OH, to clarify: the early mafs didn't have the intregrated IAT sensor, but that had nothing to do with size or airflow compared to the later units.
So, save your money for an '01 or later intake manifold, and make a few real ponies.
So youre saying a ls6 intake manifold? How much hp we talking 5hp or 10hp gains on a cammed header car. I should have went with a 25% ud pulley it was 80$ extra plus the belt but didnt have the funds at the time. Would be worth the 10-14hp asp claims.
Correct me if I'm wrong, but the only difference with the C5 Z06 MAF was that the screen was removed. Otherwise they are all absolutely identical.
Early C5's were tuned a bit rich, so removing the screen leaned the mix a bit and actually produced a couple of horsepower.
Removing the screen on the 2000+ cars had no positive result, and could easily cause negative air turbulance effects when using an aftermarket filter.
Been there done all that.
DG
What year early c5s are we talking that were tuned rich and the maf screen gone actually added hp. Mine is a 99 but i had it dynotuned with the stock descreened maf. That screen crunched takes up about 1/3 of the maf sensor inlet.
Yes so the z06 maf is descreened from the factory somewhere i read it was larger 86-88mm. The main reason was maybe to relocate it with the 120$ varam powerduct with z06 maf infront of the tb.
97-00 75mm MAF and LS1 intake
01-04 all C5s had a 85mm MAF and LS6 intake.
So would it help to change over to the 01+ or 02+ maf that didnt have a screen and is 85 maf with the incorporated IAT sensor? I would if the the tune file calibrations are much different. I was thinking of doing the varam powerduct for the 01-04 with the maf infront of the the throttle body. I have a dynotuned 99 ls1 cam and headers corvette. Now Since the later is a 85mm maf would the cheaper maf ends that are wide open and dont narrow down as the factory ones do flow just as much as the 85mm maf. The outside should still be 88mm or 3.5" or 3.75"? unless they changed to 4" couplers.
If you have a screened MAF, 75mm or 85mm, you can remove the screens. I believe 01 C5Zs had screens. It isn't a big gain between any of the MAFs on a bolt on car, heads, cam, FAST intake you might see 10-15rwhp IMO. I had my FRC dyno tuned with a 85mm MAF and it was turning pretty much the same numbers as cars with the early MAF. Cook book build back then, TEA Sg2 5.3s, 228/230cam. Granted it was on a LS6 intake not a FAST 90 which were still very new.
75mm to 85mm would require a tune, just removing the screen and keeping the same size MAF would not require a tune.
When I bought my 2000 coupe in 2012 the prev owner had installed a VaraRam and the later 85mm maf.
Within a week of buying my car I bought HPT. Learning the LS platform and tuning was the reason I bought the car.
Anyway, took it to the drags and it ran an astounding 14.3@97 mph. 2nd pass the same and threw a MAF code.
I was too green with HPT, but quick search said the two maf curves were different. So I bought a stock maf here on the forum.
Took the car back to the track and it ran 13.07@107.
So needless to say, you need to tune for the larger MAF. It’s one table, you can copy the data from any 01 or later C5.
The unscreened MAF data is slightly different than the screened version.
FWIW, GM used the 85mm screened version on many trucks as well. So they are easy to find and cheap.
When I bought my 2000 coupe in 2012 the prev owner had installed a VaraRam and the later 85mm maf.
Within a week of buying my car I bought HPT. Learning the LS platform and tuning was the reason I bought the car.
Anyway, took it to the drags and it ran an astounding 14.3@97 mph. 2nd pass the same and threw a MAF code.
I was too green with HPT, but quick search said the two maf curves were different. So I bought a stock maf here on the forum.
Took the car back to the track and it ran 13.07@107.
So needless to say, you need to tune for the larger MAF. It’s one table, you can copy the data from any 01 or later C5.
The unscreened MAF data is slightly different than the screened version.
FWIW, GM used the 85mm screened version on many trucks as well. So they are easy to find and cheap.
Ron
Was that a bone stock 2000 auto 2.73s with just thew larger z06 maf or did it have an intake air filters, exhausts? Yes i was thinking of doing the varam powerduct and later style maf if not just the varam powerduct and trying the maf in both positions if its possible close to the throttle body but i think infront of the air bridge is fine. Also maybe the 90mm tb with adapter and larger maf i think will flow more at part throttle vs full throttle with 42lb injectors but would require retune which is expensive.
Ok now that ive had the car dynotuned with the stock unscreened maf it should be set up correctly? It runs but id hate to mess the tune up relocating maf infront of the tb which shouldnt hurt. Does both the varam 97-00 iat sensor air bridge include the exact same dimension powerduct and couplers to make the maf sit either infront of the tb or infront of the air bridge. I really like the sleek black look of the 01-04 varam black couplers which deosnt have the red stencil writing and would require drilling for iat sensor or converting to the later style maf. Does anyone notice an increase in IAT with the maf located near the tb?
Nice times im hoping with the auto 3.15s, small cam and headers, straight pipes, volant oval filter i can get down the track somewhere in mid 13s 110mph.
What mods did the auto 2000 have that ran 13.07 at 107mph stock tune? and what tires did you use 60ft? I want to try and make a high 12 second pass at 110mph+ but takes good mt et streets. Stock 5.0s ran that in 2011-2012 12.9s at 112-113mph but are 6 speeds vs the 4l60e 3200lb corvette with 3.15s. I think id be lucky to hit mid 13s at 110mph with my current setup.
Unfortunetly the shop told me a whole retune cost as much as the first tune. They use to charge half the price for a retune. Im not sure if thats what every ls tuning shop is doing these days or not. Mine was in response to bigger injectors.
You are good at asking a ton of questions Justin. I enjoy your passion. 😊
Couple photos will answer quite a few.
Borla cat back was the only other mod. It did have some sort of tune in it, not sure what they did.
I added the power duct. It had some bizarre carbon fiber snake head thing on it.
Car had 3.15 gears.
The stock 97-00 engine will flow about 600 cfm and the stock TB will flow almost 750 cfm. With the Z06 introduction, GM wanted to car to accelerate faster and enlarged the Intake and TB to compensate. To save money all the 01-04 cars had the same TB and Intake. The later intakes changed the air flow slightly so the latter LS1 cams were slightly different to make the additional 5 HP increased torque. The exception was the 2000 cam which was detuned to make the 345HP and torque specs of the 97-99.
The stock 97-00 engine will flow about 600 cfm and the stock TB will flow almost 750 cfm. With the Z06 introduction, GM wanted to car to accelerate faster and enlarged the Intake and TB to compensate. To save money all the 01-04 cars had the same TB and Intake. The later intakes changed the air flow slightly so the latter LS1 cams were slightly different to make the additional 5 HP increased torque. The exception was the 2000 cam which was detuned to make the 345HP and torque specs of the 97-99.
I believe the 2000 camshaft would make more power in the later engines than the later camshafts would make. But it would be so small it wouldn't be worth the trouble to swap......
In the early years some W2W guys ran the 2000 cam and 1.8 lifters and made close to 400 engine dyno HP, when the 2002 Z engine came out the stopped that and when to the newer Z engine
03-27-2022, 10:48 AM
swapping early maf to z06 maf
