i think that dyno was off. and yes, it's fully possible for a dyno to be off. the torque looks about right. considering for drivetrain loss, the HP number looks about the same as it should for a TBI GA16. the torque numbers look about right, an increase of about 10lbft over stock, but the HP numbers are way down, with an increase of only ~1 max HP, though you did say top end didn't feel much better, but mid range was great. i still say i think the dyno's HP numbers are off, because the swap should have increased that alot more than 1hp. also, you could need new valve springs.
also that curve is so shakey it looks wrong, and look how rich you're running until about 5k rpm.
that torque number, i like it it looks proper. being a 3valve head, it should have more torque than a 4valve head, and low and behold, a GA16E has more torque than a GA16DE (bout 82lb.ft stock).
after i've built my all motor GA16E bob, i'll have it on the best dyno in town, and i'll post what a well built stock block GA16E can do.
Yeah I did hear mention that this particular Dyno was not very accurate below 250HP since it is rated for 1000+ HP. I heard some people say that between the 5-6 dynos in town that there was about 20% difference between the highest and lowest.
The GA16I was supposed to produce a peak 90HP @ 6000 RPM but my HP dropps at 5,000 RPM.
When I get my headers tomorrow and eventually my Euro cam and check the back pressure on the exhaust I shall know a little more.
BTW the mixture was too LEAN untill about 4,000, and got richer around 5,000-6,000 RPM
It actually produces the best TQ when the mixture is leaner.
my bad lol, read it backwards. but yeah, that makes sense now that you've mentioned its calibrated for more hp.
i wouldn't return there then, as a GOOD dyno crew can recalibrate it to make ready for you.
also, considering the hp peaks at 6k, the MPFI swap should have increased that range to peak at a higher RPM. like you're suggesting, you could have exhaust blockage, or weak valve springs.
I just drove it to see the back pressure; it is 5-6 PSI at the exhaust manifold from 4,000RPM-redline at full throttle. What is considered normal?
I don't really know, but it could be too high, I should do some more research...
I know the pulsar is lighter than the sentra, but it is so much quicker than the sentra there is almost no comparison. I am going to do some more searching and see what I find...
that's actually alot of back pressure. no car should have more than 1-2psi. you might have a clogged cat. i'm assuming your sentra has a good cat. either switch them or test the back pressure in the sentra to see how that is.
Got my headers today, and put them on. I drove around with open headers for a few hours, and was happy with the performance. When I get up to 5,000 RPM the HP does not feel like it drops off, but keeps on pulling. I next welded up an adapter flange to hook the headers to the rest of the exhaust, and drove it some more. With the cat and muffler hooked back up it loses power again around 5K but not as bad as before. I need to hook my pressure gauge back up to see what the backpressure is at now. I suspect the problem lies in the muffler, since it has a very small tailpipe (about 1" ID). The cat I have installed now is not plugged, but is not really great for high flow.
Yet another thing for me to eventually look into.
you could use a glasspack and the pacesetter exhaust. less expensive and a better solution to your back pressure issues possibly. but i understand the want to keep a cat too. you could just go with the pacesetter. i mean, on the project 1.6, they saw an increase of 6whp with it. which is massive for an exhaust system, especially on a 1.6.
Hey all, I'm back from my deployment overseas. I have some bad news though.
I was going on a road trip, and checked all my fluids including antifreeze. In a moment of regretable stupidity I forgot to put my radiator cap back on and drove the car. It was raining very hard, so I did not even notice it was boiling all the water out, and over the noise of the rain by the time I heard the engine pinging it was too late.
The head is cracked, so project GA16E is now on hold until I get another car (preferably sentra) to bolt my MFPI swap on to continue the project.
A few things I have learned...
1) DO NOT build a project engine and leave the Gauge Temp sensor off because there is no bung to thread it into.
2)Things must be done in the proper order, IE get all the right coolant lines and housings before assembling the rest of the engine. It is a Pain in the butt to get them on after the rest of the engine is assembled.
3)The GA16 has great potential, but if you don't have the time to do things 100% right you should not try to mod your daily driver!
As far as I am concerned this project was a huge success, and I am certainly going to continue it with another car in the not so distant future. I have gotten my 89 sentra back up and running and the difference in HP is night and day between the two.
Bob
Hey all, I'm back from my deployment overseas. I have some bad news though.
I was going on a road trip, and checked all my fluids including antifreeze. In a moment of regretable stupidity I forgot to put my radiator cap back on and drove the car. It was raining very hard, so I did not even notice it was boiling all the water out, and over the noise of the rain by the time I heard the engine pinging it was too late.
The head is cracked, so project GA16E is now on hold until I get another car (preferably sentra) to bolt my MFPI swap on to continue the project.
A few things I have learned...
1) DO NOT build a project engine and leave the Gauge Temp sensor off because there is no bung to thread it into.
2)Things must be done in the proper order, IE get all the right coolant lines and housings before assembling the rest of the engine. It is a Pain in the butt to get them on after the rest of the engine is assembled.
3)The GA16 has great potential, but if you don't have the time to do things 100% right you should not try to mod your daily driver!
As far as I am concerned this project was a huge success, and I am certainly going to continue it with another car in the not so distant future. I have gotten my 89 sentra back up and running and the difference in HP is night and day between the two.
Bob
I just bought a JDM GA15, project GA16E/GA15E continues!
Does anyone know what cam the JDM GA15S has? It certainly is different from the stock GA16I cam. The GA15 head is already ported out around the intake manifold (for the injecters), so the MPFI manifold will be a even better match for this head. I am excited to see what the short stroke will do for my RPM's, now if only I could tweak the stock ECU to boost the redline past 6,500RPM!
.:EDIT:.
also the GA15 comes with the front housing for the radiator hose threaded for a sensor, which looks like the perfect place to add my temp gauge sender without any modification or drilling!
I just bought a JDM GA15, project GA16E/GA15E continues!
Does anyone know what cam the JDM GA15S has? It certainly is different from the stock GA16I cam. The GA15 head is already ported out around the intake manifold (for the injecters), so the MPFI manifold will be a even better match for this head. I am excited to see what the short stroke will do for my RPM's, now if only I could tweak the stock ECU to boost the redline past 6,500RPM!
.:EDIT:.
also the GA15 comes with the front housing for the radiator hose threaded for a sensor, which looks like the perfect place to add my temp gauge sender without any modification or drilling!
so are you just using the manifold, or the entire engine? and did you order a ga15E or S?
The Listing was for a GA15E, but when the engine arrived it was the GA15S with a carburetor. The intake ports are opened up around where injectors would go on a GA15E, my guess is the factory uses the same head for all GA15 engines whether it be E, S, or I.
I plan on just swapping all of the old setup onto the new block and head. If all goes well, I will have this project going again in just a few more weeks. The setback is I am leaving on the 10th of August for 2-4 weeks and I don't want to rush anything this time. I think at the very least I will get everything put together on the GA15 and get it ready to drop in when I get back.
BTW if anyone buys the JDM GA15 it has SOLID mechanical lifters and a plastic lifter cover! Also you will have to fabricate or find and buy a cover for where the mechanical fuel pump was. Other than that it looks like a very streight forward swap.
Cheers!
Bob
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it looks proper. being a 3valve head, it should have more torque than a 4valve head, and low and behold, a GA16E has more torque than a GA16DE (bout 82lb.ft stock).
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