4.9 perfomance = 3800sc?????

[product1620]

I was googleing around and came across this website http://fieroaddiction.com/ If you notice when he talks about the 4.9 he says something like the 4.9's performance is very close to if not as good as the 3800sc's. What? I thought that the 4.9 would be closer to a 3.4TDC (which he says dosen't perform as well as the 4.9), while the 3800sc would cream a 4.9. so whats the deal? he seems like he knows what he's doing with all these swaps, but that comment through me for a loop. He does have more info on the 4.9 than the other swaps, so maybe he's a little biased toward the engine but my question is why? :scratch:

[Fastback86]

I forget who owns the site, but a 4.9 being equal to a 3800SC is one of the dumbest things I've heard today. The only advantage it has over the 3.4DOHC is its monstrous torque, but the 3.4 will blow past it as soon as it hits its powerband.

[product1620]

The car is a lot of fun to drive, but it just doesn't have enough power to keep me smiling for very long. I took it to Island Dragway and ran a best 1/4 mile time of 14.38

I wonder why I didn't see any 4.9 1/4 mile times?

[Fastback86]

Cause the only people who will run a 4.9 in the 1/4 are PBJ, Becky, and Rockcrawl because they turbo'd them. The rest aren't going to advertise the fact that their V8s are running 15s.

[THE PUNISHER]

It's rockcrawls site...

he knows what he's talking about more than 99.9% of the people on this forum. And besdies most people who build 4.9's use J-yard motors with 1 million miles on them and attach the engine to a stock th-125 , and don't do anything with the computer. I believe Rockcrawls 88 witha 4.9 and a 4.10 ran mid to low 13's , which is more than enough to play with a stock 3.8SC which typically run high 13's low 14's The man knows what he is talking about and how to build a car.

and we shall leave it at that.

[Fastback86]

It's rockcrawls site...

he knows what he's talking about more than 99.9% of the people on this forum.

and we shal leave it at that.

Ahhhhhhhhhh, thats right. Rockcrawl definately knows way more than me, but I still don't agree that a 4.9 is as good as a 3800SC and significantly better than a 3.4 DOHC.

[product1620]

I believe Rockcrawls 88 witha 4.9 and a 4.10 ran mid to low 13's , which is more than enough to play with a stock 3.8SC which typically run high 13's low 14's The man knows what he is talking about and how to build a car.

I thought the 3800sc's ran high 12's to low/mid 13's depending on the driver, I could be wrong though. :dontknow: 3800SC guy's help us out with some QM times please.

[Series8217]

I believe Rockcrawls 88 witha 4.9 and a 4.10 ran mid to low 13's , which is more than enough to play with a stock 3.8SC which typically run high 13's low 14's The man knows what he is talking about and how to build a car.

I thought the 3800sc's ran high 12's to low/mid 13's depending on the driver, I could be wrong though. :dontknow: 3800SC guy's help us out with some QM times please.

It's going to be hard to find those times, most people don't run the 3800SC with a 4.10

[THE PUNISHER]

Engine choice comes down to personal preference and is one of those issues where you never really come to a clear agreement.

[Fastback86]

Engine choice comes down to personal preference and is one of those issues where you never really come to a clear agreement.

Thats the only thing anyone can agree on.

[Shaun41178(2)]

Jesus here we go again with this debate. so tired of it.

Yea rockcrawls site. He knows what he is doing with the 4.9. He did a few mods to his 4.9 and got it to run in the mid 13's I think. Might be on the qtr mile list. The 4 spd manuals really help out compared to the autos most people run.

THe majority of everyone else uses junkyard crap and swaps from a 4 banger to the 4.9 so it feels a ton faster while throwing 3 error codes and running 15's But in typical .nl fashion, if one person runs X time in their fiero, then everyone else with the same setup claims the same times without ever going to the track, and then month by month shave a tenth or two off that time while still never going to the track to make it seem better then it obviously is.

I know scrabblegod on here with a 4.9 and an auto got mid 14's as a best with his 4.9 while it being stock with maybe a intake or something but nothing major. He did some head porting and a larger cam and ran a 13.9 then.

Most dohcs witht he manual trannies in Fieros have run anywhere from 13.9 to 14.4 that I have seen. I beleive sinister on here with his dohc 5 spd ran a 14.1 with a completely bone stock motor sans a custom chip by himself.

THese are the facts. See them how you will.

[The Dark Side of Will]

My impression was that a reasonably stock Fiero with a reasonably good driver and about 200-210 crank HP could crack 13's. That *should* put the 3.4 TDC, 4.9 and 3800 N/A about the same level as they all make about that much power.

However, as Shaun pointed out, it can be tough to get some swaps running to their full potential. It's easier to do with the 3.4 and 3800 than with the 4.9 so the 3.4 and 3800 swaps have a tendency to run faster than the 4.9 swaps.

Jon's modded 4.9 ran 13.2 @ 102 if memory serves.
That's about what my box stock N* ran at my first time at a 1/4 mile strip with an unplugged IAT sensor.

I was also under the impression that most L67 swaps ran mid 13's, with the occasional freak almost cracking 12's.

[eHoward]

Jon likes the 4.9. His stock out of the box, performance is similar to the 3800sc.

He's done a ton of swaps and that's what he prefers.

so maybe he's a little biased toward the engine but my question is why? :scratch:

[Fast88Fiero]

My impression was that a reasonably stock
I was also under the impression that most L67 swaps ran mid 13's, with the occasional freak almost cracking 12's.

I ran a 13.9 with a 87GT that had a 100% stock L67 mated to a Getrag 5 speed.

I've also driven all 3 swaps (4.9, 3800sc, 3.4DOHC) with stock engines. The performance is pretty similar in all 3. The 4.9 and 3800 are the best off the line. The 3800 and DOHC are better at anything above 60-70mph because a stock 4.9 will run out of breath at higher RPM.

[rockcrawl]

Yes, here we go again.....

I like them all (except for the 3.4). I documented the 4.9 because that's what I was into when I built the website, and because you can't find that info anywhere else on the web, at least not at that time. I'm not biased toward the 4.9, I may have been at one time, but not any more. I do prefer a V8 and I suppose I always will. I currently own one 4.9, one 3800, and four Northstars (the only one running is a Northstar, but you get the point.). Variety is key to my happiness. Well, that's one of the keys.

A STOCK 4.9 with a 2.73 4T60E trans will run 13.89. I have done it. I cannot prove it. End of story.

That is in fact "very close to if not as good as the 3800sc's" as it says on my website. I'm talking about a STOCK 3800SC, once you change the blower pulley it's no longer stock. I really don't think there is a stock 3800SC going a whole lot faster than 13.9, but I could be wrong. Surely there is no series I that can match that.

Once you get into modifying the engines, all bets are off. 3800 will almost certainly come out on top because of aftermarket support.

Then there's the differences in trans ratios and such. I built two seemingly identical 3800 SC cars, the only difference being one car has 3.08 gears and a high stall converter and the other has 2.96 gears and a stock converter. The first car is consistently .5 second faster.

60 degree V6s go directly to the scrap yard unless I can find some fool to actually pay money for them (suckers). I do have four of them here now, one actually still runs well, two with spun rods (what a surprise) and one completely seized (no doubt from a spun rod bearing). Hey, did I ever tell you guys about all my experiences with spun rod bearings on V6-60s? Ah well, not enough time for that tonight.

Sorry for the semi-long post. For some reason I felt like I had to explain myself instead of just telling people to piss-off like I should. Oh, Fastback86, you can piss-off.

[product1620]

thank you for takeing the time to explain it. I wasn't at all trying to start a debate I just wanted a clear answer, because it seems when people talk about the 4.9 and 4.9 owners its almost always in a negative way and they don't take the time to clarify them selves by saying that their refering to douche bags who dump in a JY motor.

[Fastback86]

Sorry I'm not a 4.9 fan, rockcrawl. I believe I pointed out that you know far more than I, I just happen to have a different opinion. Big deal.

[Aaron]

Huh, cause I thought I read about a 4.9l spinning a rod bearing right after his 13.9. Oh yah, it's becuase I did.

And it isn't hard to prevent your 3.4 from spinning bearings. Synthetic oil every 3k, a nice filter, and limit the runs to 6500rpm. Still sky high compared the the 4.9l, and just as reliable.

[SappySE107]

.

[crzyone]

Huh, cause I thought I read about a 4.9l spinning a rod bearing right after his 13.9. Oh yah, it's becuase I did.

Of course that had nothing to do with the oil cooler line he broke shortly before and starving the motor for oil....