661rex89si

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91-ef-hatch &raquo;</TD></TR><TR><TD CLASS="quote">Intake and a header will do what you want </TD></TR></TABLE>


x2 plus advancing the timing a bit will help

SIred91

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Brain3208 &raquo;</TD></TR><TR><TD CLASS="quote">

Lol, This made me laugh a bit, considering just about any stock car out their would still smoke the **** out of this speed just driving normally. not exactly a "race car" or even fast but whatever. OP, You could pick up a used Nitrous setup prett cheap and that will give the car the highest benifit with the fewest modifications. I built a ton of D series engines, not much other than FI makes them perform. Pull of the exhaust completely and intake completely, new cam, and that is about all it will ever do. Without FI of some sort D series engines just suck ***. Great little engines tough for the price but not NA.

Good luck!</TD></TR></TABLE>


Thats great and all----but uh, Bisimoto put a D15 all motor into the 10's bud.

In a CRX

bossman032

I went a 16.1 today in the 1/4 mile.

and I won a trophy!

OversteerMotorSports

TURBO THE BEEeEEEEEEEEETCH DOOOOOOOD

1991HondaCRXguy

I love my 91 CRX with the D15B2 engine I'm rocking. I've got 20 over pistons and 10 over rods, full exhaust system, Cold Air Intake and soon rest of the motor will be built as well and then turbo. Totally rebuilding it from the ground up one step at a time !

Freemananana

iTrader: (3)

I'm pretty sure there are very few people with pockets deep enough to make a NA SOHC setup that could match a budget/junkyard turbo DOHC setup. One of the best SOHC NA setups I have seen was pushing 160 or 180 HP, forget which, but that's a lot. Just because some company spent more money than anyone can imagine doing something, doesn't make it a valid arguement.

The D16A6 is rated at what, 106 HP? Factor in 20% drivetrain loss, call it 85 HP to the wheels. Bolt ons may net you 10~ HP. Anything under 10 HP is usually negligable and isn't something you can feel. Everyone's but dyno will tell you different though. For $250, the extra couple HP isn't worth it to me. It really won't be much faster and a very simple, everyday car, will still be faster.

Anyways, I do believe NA has it's place. But for the price, FI will be cheaper than NA if you are aiming for larger power gains. Try building a 200 whp D-series, tell me how that goes while staying NA.

ej1995

why in the hell is this coming back from 07??? lol

Freemananana

iTrader: (3)

Dammit! Fooled by the guy with 10 posts again!

Todd00

Necro bump for a dumb reason fooled you , but your WHP guesstimates are waaay off with the d16a6.

*stock* those motors (in good condition) put down 100ish hp @ the wheels. They were vastly under-rated.

A good header frees up the most HP and will be the best bang for your buck with the a6.

I've personally seen I/H/E 89-91 Si's with an ECU tune put down ~125ish HP @ the wheels. The d16a6 is a great motor. I always laughed at the guys who swapped them out for the "superior" DOHC (ZC) version and were no faster.

Freemananana

iTrader: (3)

It always does, I just browsed the thread and then posted something. I would say high 90s may be accurate for them stock and the header does open up a good amount of power from them. I have seen the 120 whp dynos of the A6 with just I/H/E and a tune. I'm thinking the tune was pretty important. That was sort of what I meant to say. You can buy a brand name header for $100, used, or maybe an eBay knock off for less. Intake is probably $20 for the piping and $30 for a K&N filter. I think the filters run around there, never bought one. And then the exhaust work will put you back probably $200+. All that, and without a tune, you won't really net very much in my opinion. With a tune, I can imagine more. But I don't think the stock map takes advantage of the increased flow, does it? I could be wrong. I've said it before, I'm a DOHC VTEC fanboy. That is the Honda motor for me.

Todd00

To be honest, most people tune for more RPMs with the A6. A tune will certainly help, but it isn't nearly as much of an upgrade as a good header.

When I say good header, I mean something like the original DC Sports 4-2-1. That header was actually one of DC's first designs back in the day and they pretty much nailed it. Folks have put $1000 hi-techs on an n/a a6 and really didn't improve anything.

I would not be afraid to race a stock B16 in a 89-91 Si vs an a6 Si with I/H/E and tune. My money would go to the D-series.

Freemananana

iTrader: (3)

Hmmm. I don't know what kind of racing you'd suggest (1/4, track, ect?) but that would definitely be close. The SiR I B16A is rated at 158 HP, probably closer to 140 to the wheels, maybe less depending on condition. The A6 in this probably has 125 to the wheels. I'd go with the B-series, but I can't argue that it would be close. The LS and the SiR I run similar times very often. But this is turning into a bench racing thread. I/H/E and tuned A6 would be a very nice car for stock class racing. It's actually a very good car for stock racing.

Todd00

Stock the 89-91 Si runs anywhere from a 15.5 to 15.9 1/4 mile. I trust the OP in this thread:

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/wanna-know-what-freak-stock-91-si-can-run-drag-times-inside-760861/

With another 20whp with I/H/E and tune, I don't think a B16 swap stands a chance.

Freemananana

iTrader: (3)

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/b16-swapped-ef-hatch-1-4-times-89336/

We can do this all day if you want. I'd say it would be close. Definitely come down to drivers. But B16s in EFs can break into the 14s.