hate my non-seq... damn haltech and vacuum hoses.

 

No more preachy than all of the people who always come in saying how much better non-seq is -- just downshift, more reliable powerband, better on the track, etc. I've seen MANY forum members have seq problems, go non-seq as a result, and then start going on about how much "better" it is. I disagree.

And the seq system has MUCH better low end than non -- full boost at 2800 rpm is considerably better than 4000+ (which is where it would be with a stock cat/porting). I experience non-seq all of the time on the highway, due to the way the PFC runs the seq system. I hate it. Oh wait, I know, just downshift!

The only time I have ever been caught out by the transition on the "track" was at an auto-x, where my rpms actually dipped low enough on course to go back to seq operation. On the real track, once you leave the pits, you are in non-seq the whole time anyway.

Anyway, this has been debated many times already -- both sides staunchly defend their own viewpoints and no one really gets anywhere. This thread should be closed, as there are dozens of threads just like it.

 

Maybe if the people converting to non-sequential would lose their catalytic converter and do the conversion properly, we wouldn't have anyone crying about no boost until 4,000 rpm, and no low end...

 

Isn't it the consensus that, once you have

-Full Exhaust
-Intake
-12 + psi

at the bare minimum, meaning you could be doing alot more, that you prefer non-seq?
My point is that Ryanberg is absolutely right...we almost always go non-seq because our system is having hiccups somewhere and we are tired of it. But, these people that keep having seq problems are putting down serious HP. The vast majority of guys saying 'no, keep seq...I never have problems with mine' are mostly stock and DON'T have those 3 BASIC mods.

I am not being sarcastic, but I would like to hear from the seq. users with the big HP numbers......and please, AT LEAST those 3 BASIC mods that really make the FD come alive.


Raj

 

What do you consider big HP numbers? At our dyno day today in NorCal a bunch of folks with "3 BASIC" mods and more running sequential were putting down 270-280rwhp (Dynojet dyno, ~80F ambient, mild humidity) on 91 octane gas/11-13psi boost with M2 Stage 3 and PFC for ECUs.

I don't think its really a good idea to run 14psi+ on stock turbos in seq/non-seq as their efficency starts to go way down.

I also believe that people focus too much on horsepower instead of making their car fast. Suspension, tires and gearing are as big a factor in the cars acceleration (at low speeds, gearing up into the middle speeds).

I had a '65 Mustang that would redline in 4th at 110mph and I'd reach that well before the end of the 1/4 (it ran mid to high 12s). 99% of the time you aren't going those speeds anyways so as long as you can make the car hook up gear it lower and get more usable power.

 

I dyno'd yesterday also and put down 316 rwhp & 255 ft/lbs. @ 1 bar running the poor-man's non-seq. I was hoping for more hp, but oh well my cat-back is too restrictive...

Anyway back on topic, I don't like the NS lag since 90% of my driving is in city from light to light, etc. However, once you get going it's fine, drop a gear and boost is ALWAYS there at 3600-3800 rpm(14.5 psi)

I think about going back to Seq all the time, but the truth of the matter is that I am hesitant(read: too lazy) to spend the time converting back to seq without being 100% sure that I would be able to get my seq system working perfectly the FIRST time. I also forgot exactly how to reverse the process.

I did talk to another forum member who is going to do the V8 conversion who's seq system is running perfectly. An since my turbos are going south(oil leak) and I'm in need of new turbos anyway, we talked about swapping his turbos, seq control system and all, into my car. That way I could be reasonably sure that my seq system will work.

 

Tracy - I consider big HP numbers with the stock twins anything over 309rwhp.


My point was that, once we all start to see these #'s, we freaking pop vac. hoses, burn solenoids...what ever. It is just a never ending process of constantly fixing it. I would love to have my big HP and the seq.....but, since I switched it has been 99% more reliable against the abuse of big HP.



Raj

 

I had nonsequential for over a year. My turbos boosted 15psi for the whole time. I recently sold them to Toms93r1 and he said they were working great in his car. I am not sure where you are getting your info surgeman, but non sequential will not hurt the life span of twins. Lag ,maybe if my engine wasn't ported with full exhaust. Personally I loved it over the sequential but no more twins for me