[MacDizzle]

So my new MMR 4.75 is really kick ass! One thing thats happening though is that after driving, say I stop at a gas station or where ever. When I re start the car it sometimes doesnt start but does a small "pop/ backfire" Im not really sure whats up with this. My coils are kinda old and have been removed and re installed a ton of times and I had issues starting the car before my engine swap etc. Could this be just a weak starter or coils? I noticed this start happening after only a couple days. Ive already taken it on a small road trip up Island here on Vancouver Island. I am in love with this motor and setup I have now and am so glad my old motor was dead. It sounds, feels and revs so smooth and mean. I just wish i could have had a few more grand for those trickflow heads and cams but oh well its pretty sweet for now as is. Im already doing the second oil change.
P.S. MMR Never did send me my timing cover bolts!

[NickPohlAandP]

First of all Mac, please don't type in that blue anymore, that shit is painful on the eyes. Second of all, for your issues, you are giong to need a tune. You have more displacement now. I guarantee that although the engine might sound like it's running good, it isn't. Get a tune.

[MacDizzle]

Take it to a Dyno are you saying? Is the Diablosport HP Tune good enough? Do you think a Dyno tune will pump it up a bit?

Originally Posted by NickPohlAandP First of all Mac, please don't type in that blue anymore, that shit is painful on the eyes. Second of all, for your issues, you are giong to need a tune. You have more displacement now. I guarantee that although the engine might sound like it's running good, it isn't. Get a tune.

[NickPohlAandP]

Originally Posted by MacDizzle Take it to a Dyno are you saying? Is the Diablosport HP Tune good enough? Do you think a Dyno tune will pump it up a bit?

I don't think any canned tune will be good for a 4.75. It needs to go spend some time on a dyno with a wideband hooked up and tested and adjusted under all loads and rpm ranges. A standard handheld tune is going to be designed for a 4.6. You have a 4.75. Your fuel and timing tables are going to be different. They won't be drastically different, but enough to necessitate a tune, and yes, you are definitely leaving power on the table until you get a real tune put on it.

[MacDizzle]

Originally Posted by NickPohlAandP I don't think any canned tune will be good for a 4.75. It needs to go spend some time on a dyno with a wideband hooked up and tested and adjusted under all loads and rpm ranges. A standard handheld tune is going to be designed for a 4.6. You have a 4.75. Your fuel and timing tables are going to be different. They won't be drastically different, but enough to necessitate a tune, and yes, you are definitely leaving power on the table until you get a real tune put on it.

Ya i bet your right, its just hauntingly similar after all of this to have little things like that happen. Dude is your motor finished yet? I cant wait to see a video of your car with your heads etc. I hope your right about about the bit of extra ponies on the table, that would be an extra bonus right now. People who had commented before about this engine being a "Slow dog" With the PI Heads and cams are wrong btw. It has a noticable extra kick and all around just awesome feel than the old W4.6. I think if i were Supercharged right now I would have died on that road trip in the rain yesterday, as is I have to barely feather the pedal to make it not get squirrly. lol

[NickPohlAandP]

Nergal shipped my reluctor wheel to me yesterday. I should have it by Friday and finish putting the engine together this weekend. I'm anxious, but seeing as today was supposed to be my dyno day, I'm not too worried about it anymore. I guess I'll just take it as it comes. I've got my trusty Silverado to get me around until then.

[CobraStang161]

sorry nick im going to have to disagree with you. 1.75ci is so slight its not going to do squat to the tune. Mac get new coils for a new engine, you wouldnt reuse old spark plugs why old coisl?

[MacDizzle]

Originally Posted by CobraStang161 sorry nick im going to have to disagree with you. 1.75ci is so slight its not going to do squat to the tune. Mac get new coils for a new engine, you wouldnt reuse old spark plugs why old coisl?

Just money really, which coils would you suggest? The MSD Coil pack I was thinking. I saw there for like $400 I think.

[NickPohlAandP]

First of all, it's not a 1.75 cubic inch difference, it's about 9.5 cubic inch. I realize that it's not drastic, but it's something to be considered. Secondly, there are no better COP's for our engines than the bone stock Ford OEM COP's.

[SSG Pate]

Macdizzle dont go above 4,000 RPMuntil the engine is boke in. Also a tune is mandatory you have more displacement, and the computer is confused. backfiring is not normal unless your parameters are out.

[NickPohlAandP]

To compound on what I was saying about the displacement, now that there is extra displacement and Mac is only running a Diablo tune, as we all know, a canned tune generally only adjusts the timing and doesn't do much of jack shit for fuel. So now you are introducing MORE air with ADVANCED timing and the same fuel amount per cycle. This gives you an already lean condition, and with the extra timing advance you leave yourself more prone to detonation. Shit, these things detonate on canned tunes as 4.6's.

[CobraStang161]

Originally Posted by NickPohlAandP First of all, it's not a 1.75 cubic inch difference, it's about 9.5 cubic inch. I realize that it's not drastic, but it's something to be considered. Secondly, there are no better COP's for our engines than the bone stock Ford OEM COP's.

My apologies, i had a brain fart there for a second. 9.5 cubic inches is so small its really not going to be that much of a change, whats that like 3 extra horsepower? since he has stock heads its really not going to do anything since the heads are still flowing the same regardless what size his engine is.

And yes OEM ford COP's are the best. I bought 8 brand new oens for $35, so they arent hard to find

[Shaun03GT]

What kind of fuel pump? I always prime my fuel pump by clicking the ignition on and off like 4-5 times before I start. Otherwise it won't start right

[stal94gt]

I would say to get your tune checked out. In your parts list I see you have a mafia... why? Also your pistons are 1cc less than stock with a slightly longer stroke. Those 2 factors maybe enough change to meed your tune looked at.

[thereal2v2fear]

x2 on having your tune looked at. i haven't had a problem with backfiring with my base tune.

[codycat91]

Eric Brooks at Brooksspeed does remote tuning for $250. Just need an SCT tuner. SCT>Diablosport anyway. You can modify an SF3 to datalog (necessary for remote tuning) or just get a Livewire. Definitely DEFINIETLY should get a wideband and monitor your afr. Also, take it really easy till it's broken in. I am gonna do at least 500 miles. I gotta look into the exact break-in procedure still. You put so much money into your motor, don't blow it by skimping on the little things. Shit, it's January. Give it a break for winter till you get everything you need to run it safe. Get some factory replacement coils, a wideband AFR, and figure out something to get a good tune. Don't necessarily need a dyno (although its quicker) but you can get the same results from a remote tune. Actually, talk to Chris (Wickedsnake) about his tune, he got hooked up with a remote tune AND tuner from Amazon. It just takes longer because you have to drive, datalog, email your data, wait for a return email with a modified tune, and repeat. Keep me updated!

[ytngt]

Guys, there is some bad info in this thread.

There is a variable in the tune called something like displacement. It needs to be raised by about 3% (multiply by 1.03). Then the maf transfer function needs to be verified (street and wideband or on the dyno). Other than those small tweaks a canned tune from sct, diablo, or sniper should work just fine. The OP's vehicle should be very easy to tune.

You need a wideband also. They are super valuable.

EDIT: Cody, remote tuning is a very good thing IMO. If you use a good wideband it's almost as good as taking it to a tuner.

[MacDizzle]

I only have the MAFia becuase it came with the Predator. Its only on a stock setting. Ya maybe i should check out a tune.

Originally Posted by stal94gt I would say to get your tune checked out. In your parts list I see you have a mafia... why? Also your pistons are 1cc less than stock with a slightly longer stroke. Those 2 factors maybe enough change to meed your tune looked at.

[MacDizzle]

I already did my first oil change. I havent really gone above 4000rpm's. What can happen as a result? I havent beaten on it but what could happen if I spiked it? The backfiring is rare and has been happening before the last motor blew. So I am hoping its bad spark, I have new plugs but these coils are ancient. When I got off work tonight, it had only sat for about 3 hours today after I had the oil changed and when it started the idle was super low and almost not running. So i shut it off and re started it, it fired up and ran fine. I went to night school and started it up again just fine. I was talking to the guys at the shop today where I had my motor installed etc and oil changed. They thought it was strange that it would have trouble starting and thought i may be on to something about the coils due to the fact everything else is brand new. But ya the not knowing factor is supremely gay man!

Originally Posted by SSG Pate Macdizzle dont go above 4,000 RPMuntil the engine is boke in. Also a tune is mandatory you have more displacement, and the computer is confused. backfiring is not normal unless your parameters are out.

[86er]

Originally Posted by NickPohlAandP First of all, it's not a 1.75 cubic inch difference, it's about 9.5 cubic inch. I realize that it's not drastic, but it's something to be considered. Secondly, there are no better COP's for our engines than the bone stock Ford OEM COP's.

That extra 10 cubes is not gonna effect a tune.