[4/20/2007] Reviewed by: skyGTR -

Applicable to: '90 - '97 1.8 liter

BIPES ACU timing control unit

Simple and straight forward install. Just make sure all the wires are crimped tight. Allows the user to pick from a few pre-set settings. Retard 1 degree base on every 15,30,65F intake temperature increase; Retard 4-14 degrees based on Airflow; Start retard curve beginning at 1500,3000,3500 rpm, etc. This unit allows me to run 16deg BTDC base timing on 91 octane at 6psi JR supercharger kit.

Recommended for all those who have a JR Supercharger kit. Because this unit will alow you to advance the base timing (instead of retarding base to 9BTDC) gives you more low and midrange power, and will bump off ignition timing at the mid-high end to prevent the boost from nuking the engine to death.

Under 30 minutes to remove completely

Bipes Auxilairy Engine Management Computer

[10/19/2002] Reviewed by: Lowell Martin -

Applicable to: '90 - '97

Add on computer to adjust ignition timing.

Very easy installation on '94 Miata with Jackson supercharger. Soldered all connections for maximum reliability. Added optional intake air temperature thermister circuit per Bipes instructions. Put unit in glove compartment so I could observe leds on tuning runs. Am using 8 degrees of total retard with static timing setting at 15 degrees. Unit has performed flawlessly from installation

Excellent value for dealing with need to adjust timing on supercahraged Miatas

Under 30 minutes to remove completely

[7/7/2002] Reviewed by: Chad Smith -

Applicable to: '90 - '97 1.6 liter 1.8 liter

Piggy back style ignition timing controller.

This unit is easy to install and adjust. It has allowed me to quickly make changes as I have increased the boost level of my Greddy Turbo. It takes alittle concentration to make sure you are flipping the correct dip switches but I have no real complaints.

This product has allowed my run 14deg. timing at up to 8psi boost (so far). If it comes unplugged the car will not run so make sure the unit is secure.

Over 30 minutes to remove completely

[12/15/2001] Reviewed by: Aaron Skeen -

Applicable to: '90 - '97 1.6 liter 1.8 liter

This is a timing-retard device that works in conjunction with your stock computer to prevent knock. This computer is completely programmable without any other accessories and induces timing retard with regard to airflow, RPM and Air Temperature. There are several display modes and the software is upgradeable.

The ACU arrived on time, with clear (albeit with a few spelling errors) directions. The install took at most thirty minutes and only required a basic knowledge of wiring. After programming the computer to the recommended settings, I advanced my base timing to 14 DEG BTDC and whoosh...what a difference. The power curve was much, much more smooth and there was absolutely no audible knock ('92 with a JR S/C kit). I would recommend this product to anyone in need of timing controls and on a limited budget, as it's price tag of $200 is more than reasonable. The only problem that I have had so far has been when the plug came loose on the back of the unit and my car wouldn't start. I spent approx. 20 minutes searching, found the problem, and remedied it by mounting the unit beneath the passenger seat where it wouldn't be disturbed.

Under 30 minutes to remove completely

[6/17/2001] Reviewed by: Chris Rummel -

Applicable to: '90 - '97 1.6 liter 1.8 liter

This unit replaces the MSD and bipes mod and retards up to 20degrees of timing. A small (about the size of a cigarette pack, unit with display.

I ordered this from Dick Bipes, inventor of the now famous Bipes mod for the MSD. This unit replaces the total MSD and Bipes, and does much more. Where the MSD only retarded 6degrees under boost, and The bipes mod helped out by making it wait until the desired rpm level. The ACU goes the next step and is able to retard up to 14 degrees timeing from airflow (it hooks to the MAF wire) and 6 degrees from air tempreture. The unit automaticly scales back timing reduction if it reads that it need not be removed. Since I already had the MSD, I only needed to tap into 2 extra wires to install.

I took my first test drive today after installing last night and WOW! What a difference over the MSD. You can dial in more inital advance with this unit because it is capable of taking out more. Tuning is as simple as flipping a few switches, I feel that this unit is a much better bargan then the J&S at about half the price and much easier to tune. A very good step up from the MSD if you don't have the cash for a link or Tec II yet. Quality is excellent and the unit is very compact, The performance differnce over the MSD, even with the bipes rpm mod was very obvious,and with this I will be able to dial in a few more degrees of initial advance for even better throttle response and power. This unit also uses a replaceable and upgradeable chip for upgrades or changing rpm maps etc in the future. A definate big bang for the buck. I highly recommend it. RumNHammer

Under 30 minutes to remove completely

Bipes Mod for the MSD timing control

[4/4/2000] Reviewed by Chris Rummel -

Applicable to '90 - '97

This is a electronic Modification that makes the MSD timing retard contols rpm adjustable.

Made by Dick Bipes.

Also a led monitor that shows the timing being taken out.

I ordered the bipes mod and monitor for my MSD that came with my BEGI turbo, so I could adjust when the MSD started removing timing. Normally the MSD takes out 6degrees of timing as soon as it sees boost, this is good in a protective sense, but most detonation accures at higher rpm usually above 3k rpm. What this unit does is intercepts the retard signal, until the desired rpm, thereby improving the crisp throttle response and acceleration down low before the boost has a chance to make its power.

I also got the bipes timing monitor, basicly a 6 led monitor that also ties into the MSD and shows when and how much timing is being taken out. 1 led for every degree of timing. very nice makes tuning bipes mod very easy.

This unit is avalible from Dick Bipes either as a parts kit or fully assembled. I got mine assembled. Both the monitor and the controller are easily wired into the connections with the MSD and the controller requires only one wire to be soldered onto the MSD (yes you have to take it apart, but it is a piece of cake) This controller is great! it makes the MSD much more flexable, not only does it control the rpm, but also the rate (how much) timing is taken out at any one time. I haven't even had much time to fine tune the unit yet, but so far it is easy to use and far more easy then trying to get a j&s set up. for a lot less money too. I also like the fact that the MSD takes out the timing before detonation starts. If you are getting a forced induction kit, with an MSD controler, get a bipes mod for it. It practally doubles the usefulness of the MSD.


Under 30 minutes to remove completely

Back to Product Reviews 19 May, 2007

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