Bone stock w/tfs stage 1 cam?
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blksn955.o
Founding Member
It would help but I would not say its an absolute MUST. You would gain more from the timing curve change and A/F change...probably not much from any tune related to the cam/inj timing aspect.
I ran mine basically stock without a tune. Bone stock gt40 heads, ported gt lower and TFS cam. I ran on the gt pcm but it ran fine...except for the C&L I had for the 24#inj...but that was not a fault of the cam. Ran 13.5 @ 102 with a 2.3 or 2.4 60ft the first and only time that combo went to the track...my average was 2.0-2.1 on street tires prior.
I would say use the money for upgraded springs for the TFS1 cam. I know my gt40 heads springs were not up to the task and they were off a 95 cobra...cost about $200 installed for beehive's IIRC 7ys ago.
I ran mine basically stock without a tune. Bone stock gt40 heads, ported gt lower and TFS cam. I ran on the gt pcm but it ran fine...except for the C&L I had for the 24#inj...but that was not a fault of the cam. Ran 13.5 @ 102 with a 2.3 or 2.4 60ft the first and only time that combo went to the track...my average was 2.0-2.1 on street tires prior.
I would say use the money for upgraded springs for the TFS1 cam. I know my gt40 heads springs were not up to the task and they were off a 95 cobra...cost about $200 installed for beehive's IIRC 7ys ago.
It'll run like crap, and probably be slower than stock. Waste of time and money without any other mods. The Cobra heads don't flow that well.
Kurt
Kurt
blksn955.o
Founding Member
Research what the gt40's like and want in terms of lift/dur and you will find they tend to like split pattern cams that favor the exh. Like lift in the .500 range with .010-.015 favor to the exh and 4 or so more in favor of exh for dur. This cam has made close to and over 300rwhp +/-10rwhp on non-ported gt40's (more with the P's but done on non-P's). The TFS1 cam is a mild lazy ramp rate roller compared to others and is a step up from the stocker for gt40 heads no doubt about it...no one is saying the gt40's are the best but as far as adding a cam the TFS1 is a good fit for a gt40 combo.
Have you ran the TFS1 cam, ran or researched a gt40 headed combo? I sure did and had no issues untuned outside of a crap C&L some have had a slight idle issue (I did but again as soon as I removed the C&L it went away) but was far far from running like crap. I even ran it on a base j4j1 calibration with the stock maf (first thing I did was dump the C&L and pick up a tweecer) ran with no hickups. The j4j1 eec does respond better to mods than the gt eec do to some deep programming switches that were turned off by Roush to reduce tuning issues from the factory with the gt40 stuff. If the owner wants to keep the gt40's...the TFS is a very good way to improve performance.
FWIW I dropped 33% comp on #7 with the 13.5 combo after that run...went to a dyno session that was $10 just to see (already had paid). I put down 243rwhp with 7 cyl. That is about what a stock cobra puts down...but with 7 not 8 cyl. blowing black rich arse smoke out the tails and a 11.2 A/F
Now with the stock springs it will have valve float and even then if it did not the springs are probably due for a replacement/fresh set even with the stock cam. If no springs are done...your not going to gain much as any power you add is being eaten by valve float.
blksn955.o
Founding Member
Yes, it is possible do a search on it...there is a thread of "yet another 300rwhp gt40 headed combo". Its not every gt40 headed combo or the norm but it is very much possible. Granted they also have tunes that are spot on but its not unheard of.
The norm is probably 260-275wrhp...either way its better than a stock setup and do not run like crap.
rj95svt
Member
The cam that came in cobra's are not as good as the cam in gt's. I would not expect huge gains but cobra's respond well to a cam change. Expect some mild idle and driveability problems untuned although some don't have these issues.
300rwhp is not common with unported gt40s although it can be done. A very expensive valve job and a custom cam would be needed along with long tubes and a bunch of other bolt ons.
Consider better valve springs to be mandatory.
300rwhp is not common with unported gt40s although it can be done. A very expensive valve job and a custom cam would be needed along with long tubes and a bunch of other bolt ons.
Consider better valve springs to be mandatory.
Labora
Founding Member
IMO the cam is the weakest link of a stock 95 Cobra H/C/I. If you have things apart I highly recommend at the very least a light port job on the lower intake and a cam with upgraded springs.
The car will run fine on a stock ECU, at the worst you may experience some stalling at idle from time to time.
The car will run fine on a stock ECU, at the worst you may experience some stalling at idle from time to time.
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